modules/invoiceIn/back/models/invoice-in-tax.js

@@ -0,0 +1,18 @@
+const UserError = require('vn-loopback/util/user-error');
+
+module.exports = Self => {
+    Self.observe('before save', async function(ctx) {
+        if (ctx.newInstance) return;
+
+        const models = Self.app.models;
+        const invoiceIn = await models.InvoiceIn.findById(ctx.currentInstance.invoiceInFk);
+        if (invoiceIn.isBooked) throw new UserError('InvoiceIn is already booked');
+    });
+
+    Self.observe('before delete', async function(ctx) {
+        const models = Self.app.models;
+        const invoiceInTax = await models.InvoiceInTax.findById(ctx.where.id);
+        const invoiceIn = await models.InvoiceIn.findById(invoiceInTax.invoiceInFk);
+        if (invoiceIn.isBooked) throw new UserError('InvoiceIn is already booked');
+    });
+};

modules/invoiceIn/back/models/invoice-in.js

@@ -34,4 +34,10 @@ module.exports = Self => {
             }
         }
     });
+
+    Self.observe('before delete', async function(ctx) {
+        const invoiceIn = await Self.findById(ctx.where.id);
+        if (invoiceIn.isBooked) throw new UserError('InvoiceIn is already booked');
+    });
 };
+