diff --git a/_immobilisations.html b/_immobilisations.html
index f26b23f..00d2c40 100644
--- a/_immobilisations.html
+++ b/_immobilisations.html
@@ -174,12 +174,14 @@
 				<td class="money">{{"%d-%d"|math:$montant_immo:$amort_amount|money_html:false|raw}}</td>
 				<td><a href={{$compte_url}}>{{$account_code}}</a></td>
 				<td class="actions">
-					{{:linkbutton
-						label="Paramètres"
-						href="add_infos.html?immo_id=%s&type_immo=%s"|args:$immo_line_id:$type_immo
-						shape="settings"
-						target="_dialog"
-					}}
+					{{if ! $exist_amort || $status == "unknown"}}
+						{{:linkbutton
+							label="Paramètres"
+							href="add_infos.html?immo_id=%s&type_immo=%s"|args:$immo_line_id:$type_immo
+							shape="settings"
+							target="_dialog"
+						}}
+					{{/if}}
 					{{:linkbutton
 						label="Amortissements"
 						href="amortization.html?immo_id=%s&type_immo=%s"|args:$immo_line_id:$type_immo
diff --git a/_nav.html b/_nav.html
index a7894b5..2192b2e 100644
--- a/_nav.html
+++ b/_nav.html
@@ -3,7 +3,7 @@
 <nav class="tabs">
 	{{if $current == "index" && $subsubcurrent == null}}
 		<aside>
-			{{:linkbutton label="Ajouter une immobilisation" shape="plus" href="add_asset.html" target="_dialog"}}
+			{{:linkbutton label="Ajouter une immobilisation" shape="plus" href="add_asset.html"}}
 		</aside>
 	{{elseif $subsubcurrent == "amortization" && $type_immo == null || $type_immo == "managed" || $type_immo == "other"}}
 		<aside>
@@ -11,7 +11,7 @@
 				{{:linkbutton label="Rattacher une écriture" href="other_amortizations.html?immo_id=%s"|args:$_GET.immo_id shape="link" target="_dialog"}}
 			{{/if}}
 			{{:linkbutton label="Enregistrer un amortissement" shape="plus"
-				href="save_amort.html?immo_id=%s"|args:$_GET.immo_id target="_dialog"}}
+				href="save_amort.html?immo_id=%s"|args:$_GET.immo_id}}
 			</aside>
 	{{/if}}
 
diff --git a/add_asset.html b/add_asset.html
index 9648331..a1f0c10 100644
--- a/add_asset.html
+++ b/add_asset.html
@@ -160,7 +160,7 @@
 {{:admin_header title="Ajout immobilisation" current="module_amortization"}}
 {{* barre de navigation *}}
 {{if ! $dialog}}
-	{{:include file="_nav.html" current="index"}}
+	{{:include file="_nav.html" current="index" subcurrent="managed"}}
 {{/if}}
 
 {{:form_errors}}
diff --git a/module.ini b/module.ini
index e90d2f7..3198f3c 100644
--- a/module.ini
+++ b/module.ini
@@ -1,5 +1,5 @@
 name="Amortissements"
-description="Immobilisations et amortissements\nversion 0.30"
+description="Immobilisations et amortissements\nversion 0.31"
 author="Jean-Christophe Engel"
 author_url="https://gitea.zaclys.com/lesanges"
 home_button=false
diff --git a/save_amort.html b/save_amort.html
index a532b36..5a509a8 100644
--- a/save_amort.html
+++ b/save_amort.html
@@ -7,20 +7,16 @@
 
 {{* Infos de l'immobilisation *}}
 {{#select
-	line.id as immo_id,
 	line.id_account as account_id,
 	line.debit as montant,
 	line.id_project as project_id,
 	trans.id as trans_id,
 	trans.label,
 	trans.date,
-	y.id as year_id,
-	y.start_date,
-	y.end_date,
-	project.label as project_label
+	account.code as account_code
 	FROM acc_transactions_lines AS line
 	INNER JOIN acc_transactions AS trans ON line.id_transaction = trans.id
-	INNER JOIN acc_years AS y ON trans.id_year = y.id
+	INNER JOIN acc_accounts AS account ON line.id_account = account.id
 	LEFT JOIN acc_projects AS project ON line.id_project = project.id
 	WHERE line.id = :line_id;
 	:line_id = $_GET.immo_id|intval
@@ -30,28 +26,54 @@
 	{{:error message="Immobilisation %s non trouvée"|args:$_GET.immo_id}}
 {{/select}}
 {{:assign date_debut=$ligne_immo.date}}
+{{:assign var="amort_label" value="Amortissement %s"|args:$ligne_immo.label}}
 
 {{#load type="immo" where="$$.line = :line_id" :line_id=$_GET.immo_id|intval}}
 	{{:assign duree=$duration}}
 	{{:assign date_debut=$date}}
-	{{if $amount != null}}
-		{{:assign var="ligne_immo.montant" value=$amount}}
-	{{/if}}
+	{{:assign status=$status}}
 {{else}}
 	{{:error message="Vous devez renseigner la date de mise en service et la durée d'immobilisation"}}
 {{/load}}
 
+{{if $status == "amortized" || $status == "archived"}}
+	{{:error message="Cette immobilisation est complètement amortie ; il est impossible d'ajouter une écriture d'amortissement"}}
+{{/if}}
+
+{{* chercher des écritures liées à l'immo courante au crédit du même compte
+	et déduire leur montant de celui de l'immo
+*}}
+{{:assign total_credits=0}}
+{{#select
+	CASE links.id_related = :immo_id
+		WHEN true THEN links.id_transaction
+		WHEN false THEN links.id_related
+	END as other_id,
+	line.credit
+	FROM acc_transactions AS trans
+	INNER JOIN acc_transactions_links as links
+		ON (trans.id = links.id_transaction OR trans.id = links.id_related)
+	INNER JOIN acc_transactions_lines AS line on line.id_transaction = other_id
+	INNER JOIN acc_accounts AS acc ON line.id_account = acc.id
+	WHERE trans.id = :immo_id  AND line.credit > 0 AND acc.code = :account;
+	:immo_id=$ligne_immo.trans_id
+	:account=$ligne_immo.account_code
+	}}
+	{{:assign total_credits="%d+%d"|math:$total_credits:$credit}}
+{{/select}}
+{{:assign var="ligne_immo.montant" value="%d-%d"|math:$ligne_immo.montant:$total_credits}}
+{{:assign solde=$ligne_immo.montant}}
+
 {{* chercher des écritures d'amortissement liées à l'immobilisation *}}
 {{#select
-	SUM(l_amort.credit) as amort_amount,
+	l_amort.credit as amort_amount,
 	l_amort.label as amort_label,
 	l_amort.id as amort_line_id,
 	CASE WHEN links.id_related = t_immo.id
 		THEN links.id_transaction
 		ELSE links.id_related
 	END as amort_trans_id,
-	MAX(trans.date) as amort_date,
-	COUNT(trans.id) as amort_number,
+	trans.date as amort_date,
 	trans.label as trans_label,
 	trans.id_year as amort_year,
 	account.id as account_id,
@@ -60,20 +82,48 @@
 	FROM acc_transactions_lines as l_immo
 	INNER JOIN acc_transactions as t_immo on t_immo.id = l_immo.id_transaction
 	INNER JOIN acc_transactions_links as links
-		ON (t_immo.id = links.id_transaction
-			OR
-			t_immo.id = links.id_related)
+		ON (t_immo.id = links.id_transaction OR t_immo.id = links.id_related)
 	INNER JOIN acc_transactions_lines as l_amort on amort_trans_id = l_amort.id_transaction
 	INNER join acc_transactions as trans on l_amort.id_transaction = trans.id
 	INNER join acc_accounts as account on l_amort.id_account = account.id
-	WHERE l_immo.id = :line_id AND account.code LIKE '28%'
-	ORDER BY trans.date DESC LIMIT 1;
+	WHERE
+		l_immo.id = :line_id
+		AND account.code LIKE '28%'
+	ORDER BY trans.date;
 	:line_id = $_GET.immo_id|intval
-	assign=amort_line
+	assign="amort_line"
 }}
+	{{#load type="link"
+		where="$$.immo_line_id = :immo_line_id AND $$.amort_trans_id = :amort_trans_id"
+		order="$$.date"
+		assign="line"
+		:immo_line_id=$_GET.immo_id|intval :amort_trans_id=$amort_line.amort_trans_id
+	}}
+		{{if $line.amort_line_id == $amort_line.amort_line_id}}
+			{{:assign var="linked_amort." value=$amort_line}}
+		{{/if}}
+	{{else}}
+		{{:assign var="linked_amort." value=$amort_line}}
+	{{/load}}
 {{/select}}
 
-{{if $amort_line.amort_number == 0}}
+
+{{:assign total_amort=0}}
+{{:assign valeur_residuelle=$ligne_immo.montant}}
+{{#foreach from=$linked_amort}}
+	{{:assign valeur_residuelle="%d-%d"|math:$valeur_residuelle:$amort_amount}}
+	{{:assign total_amort="%d+%d"|math:$total_amort:$amort_amount}}
+	{{:assign date_debut=$amort_date}}
+	{{:assign code_amort=$account_code}}
+	{{:assign amort_account_label=$account_label}}
+	{{:assign amort_label=$amort_label}}
+{{/foreach}}
+
+{{if $valeur_residuelle == 0}}
+	{{:error message="Cette immobilisation est complètement amortie ; il est impossible d'ajouter une écriture d'amortissement"}}
+{{/if}}
+
+{{if $total_amort == 0}}
 	{{* 1er amortissement *}}
 	{{*	déterminer le compte d'amortissement en fonction du compte d'immobilisation *}}
 	{{#select code, label from acc_accounts where id = :id; :id=$ligne_immo.account_id assign=amort_account}}
@@ -83,15 +133,12 @@
 		code_immo=$amort_account.code
 		keep="code_amort"
 	}}
-	{{:assign var=amort_label value="Amortissement %s"|args:$amort_account.label}}
+	{{:assign var="amort_account_label" value="Amortissement %s"|args:$amort_account.label}}
 	{{:assign var=libelle value="Amortissement %s"|args:$ligne_immo.label}}
 {{else}}
 	{{* amortissements suivants *}}
-	{{:assign date_debut=$amort_line.amort_date|strtotime}}
+	{{:assign date_debut=$date_debut|strtotime}}
 	{{:assign date_debut="%d+(60*60*24)"|math:$date_debut|date:"Y-m-d"}}
-	{{:assign var=code_amort value=$amort_line.account_code}}
-	{{:assign var=amort_label value=$amort_line.account_label}}
-	{{:assign var=libelle value=$amort_line.amort_label}}
 {{/if}}
 
 {{*
@@ -101,7 +148,7 @@
 {{:assign msg_years=""}}
 {{#years closed=false order="start_date" where="start_date <= :debut AND :debut <= end_date"
 	:debut=$date_debut assign=years.}}
-	{{if $amort_line.amort_number == 0}}
+	{{if $total_amort == 0}}
 		{{:assign ts_debut=$date_debut|strtotime}}
 	{{else}}
 		{{:assign ts_debut=$start_date|strtotime}}
@@ -174,7 +221,7 @@
 	{{/if}}
 
 	{{* vérifier que le montant ne dépasse pas le solde restant *}}
-	{{:assign solde="%d-%d"|math:$ligne_immo.montant:$amort_line.amort_amount}}
+	{{:assign solde="%d-%d"|math:$ligne_immo.montant:$total_amort}}
 	{{if $_POST.montant|trim|money_int > $solde|intval}}
 		{{:assign solde=$solde|money_raw}}
 		{{:error message="Le montant indiqué « %s » dépasse le solde à amortir « %s »"|args:$_POST.montant:$solde}}
@@ -185,14 +232,14 @@
 		var="lines."
 		debit=$_POST.montant
 		account=$debit_account|keys|value:0
-		id_project=$_GET.project_id
+		id_project=$ligne_immo.project_id
 		label=$_POST.designation
 	}}
 	{{:assign
 		var="lines."
 		credit=$_POST.montant
 		account=$credit_account|keys|value:0
-		id_project=$_GET.project_id
+		id_project=$ligne_immo.project_id
 		label=$_POST.designation
 	}}
 	{{:api
@@ -211,7 +258,7 @@
 	{{:redirect force="amortization.html?immo_id=%s&ok=1&msg=amortissement"|args:$_GET.immo_id}}
 {{/form}}
 
-{{:admin_header title="Ajout amortissement" current="module_amortization"}}
+{{:admin_header title="Ajout amortissement" custom_css="./style.css" current="module_amortization"}}
 
 {{* barre de navigation *}}
 {{if ! $dialog}}
@@ -226,9 +273,9 @@
 
 {{* montant de l'amortissement *}}
 {{:assign montant_amort="%f/%f/365*%d"|math:$ligne_immo.montant:$duree:$nbjours|intval}}
-{{:assign montant_amort="min(%f, %d-%d)"|math:$montant_amort:$ligne_immo.montant:$amort_line.amort_amount}}
+{{:assign montant_amort="min(%f, %d-%d)"|math:$montant_amort:$ligne_immo.montant:$total_amort}}
 {{:assign var="debit_account.6811" value="6811 — Dot. aux amortissements des immobilisations"}}
-{{:assign var="credit_account.%s"|args:$code_amort value="%s — "|args:$code_amort|cat:$amort_label}}
+{{:assign var="credit_account.%s"|args:$code_amort value="%s — "|args:$code_amort|cat:$amort_account_label}}
 
 {{* -------------------------------------------------------------------------------- *}}
 
@@ -242,7 +289,7 @@
 		<dl>
 			{{:input type="select" default=$selected_year name="id_year" label="Exercice" required=true default_empty="— Faire un choix —" options=$open_years}}
 			{{:input type="date" name="date_amort" label="Date" required=true default=$date_amort|date_short}}
-			{{:input type="text" name="designation" label="Libellé" required=true default=$libelle}}
+			{{:input type="text" name="designation" label="Libellé" required=true default=$amort_label}}
 			{{:input type="money" name="montant" label="Montant" required=true default=$montant_amort}}
 			{{:input
 				type="list"
@@ -263,7 +310,7 @@
 			<div id="donnees" class="hidden">
 				{{:input type="text" name="montant_immo" default=$ligne_immo.montant}}
 				{{:input type="text" name="duree_amort" default=$duree}}
-				{{:input type="text" name="somme_amort" default=$amort_line.amort_amount}}
+				{{:input type="text" name="somme_amort" default=$total_amort}}
 				{{:input type="select" name="years_data" options=$years_data}}
 			</div>
 		</dl>