diff --git a/modules/client/back/models/XDiario.json b/modules/client/back/models/XDiario.json
index be543393d..e1eac2aa1 100644
--- a/modules/client/back/models/XDiario.json
+++ b/modules/client/back/models/XDiario.json
@@ -76,7 +76,13 @@
         },
         "enlazadoSage": {
 			"type": "boolean"
-        }
+        },
+		"enlazado": {
+			"type": "boolean"
+		},
+		"CLAVE": {
+			"type": "number"
+		}
     },
 	"relations": {
         "company": {
diff --git a/modules/invoiceIn/back/methods/invoice-in/toUnbook.js b/modules/invoiceIn/back/methods/invoice-in/toUnbook.js
new file mode 100644
index 000000000..4ba37330b
--- /dev/null
+++ b/modules/invoiceIn/back/methods/invoice-in/toUnbook.js
@@ -0,0 +1,78 @@
+module.exports = Self => {
+    Self.remoteMethodCtx('toUnbook', {
+        description: 'To unbook the invoiceIn',
+        accessType: 'WRITE',
+        accepts: {
+            arg: 'id',
+            type: 'number',
+            required: true,
+            description: 'The invoiceIn id',
+            http: {source: 'path'}
+        },
+        returns: {
+            type: 'object',
+            root: true
+        },
+        http: {
+            path: '/:id/toUnbook',
+            verb: 'POST'
+        }
+    });
+
+    Self.toUnbook = async(ctx, id, options) => {
+        let tx;
+        const models = Self.app.models;
+        const myOptions = {userId: ctx.req.accessToken.userId};
+
+        if (typeof options == 'object')
+            Object.assign(myOptions, options);
+
+        if (!myOptions.transaction) {
+            tx = await Self.beginTransaction({});
+            myOptions.transaction = tx;
+        }
+
+        try {
+            let isLinked;
+            let accountingEntries;
+
+            let {'ASIEN': bookEntry} = await models.Xdiario.findOne({
+                fields: ['ASIEN'],
+                where: {
+                    and: [
+                        {'CLAVE': id},
+                        {enlazado: 0},
+                        {enlazadoSage: 0}
+                    ]
+                }
+            }, myOptions);
+
+            if (bookEntry) {
+                accountingEntries = await models.Xdiario.count({ASIEN: bookEntry}, myOptions);
+
+                await models.Xdiario.destroyAll({where: {ASIEN: bookEntry}}, myOptions);
+            } else {
+                const linkedBookEntry = await models.Xdiario.findOne({
+                    fields: ['ASIEN'],
+                    where: {
+                        CLAVE: id,
+                        and: [{or: [{enlazado: true, enlazadoSage: true}]}]
+                    }
+                }, myOptions);
+
+                bookEntry = linkedBookEntry?.ASIEN;
+                isLinked = true;
+            }
+            if (tx) await tx.commit();
+
+            return {
+                isLinked,
+                bookEntry,
+                accountingEntries
+            };
+        } catch (e) {
+            if (tx) await tx.rollback();
+            throw e;
+        }
+    };
+};
diff --git a/modules/invoiceIn/back/models/invoice-in.js b/modules/invoiceIn/back/models/invoice-in.js
index af5efbcdf..ffa285ce7 100644
--- a/modules/invoiceIn/back/models/invoice-in.js
+++ b/modules/invoiceIn/back/models/invoice-in.js
@@ -10,6 +10,7 @@ module.exports = Self => {
     require('../methods/invoice-in/invoiceInEmail')(Self);
     require('../methods/invoice-in/getSerial')(Self);
     require('../methods/invoice-in/corrective')(Self);
+    require('../methods/invoice-in/toUnbook')(Self);
 
     Self.rewriteDbError(function(err) {
         if (err.code === 'ER_ROW_IS_REFERENCED_2' && err.sqlMessage.includes('vehicleInvoiceIn'))