fix: prevent modifications to transmitted edocuments

edocument/edocument/doctype/edocument/edocument.js

@@ -8,8 +8,10 @@ frappe.ui.form.on("EDocument", {
 });
 
 function setup_action_buttons(frm) {
-	// Generate XML - for outgoing documents
-	if (frm.doc.edocument_source_document && frm.doc.edocument_profile) {
+	const is_transmitted = frm.doc.status === "Transmission Successful";
+
+	// Generate XML - for outgoing documents (not already transmitted)
+	if (frm.doc.edocument_source_document && frm.doc.edocument_profile && !is_transmitted) {
 		frm.add_custom_button(
 			__("Generate XML"),
 			() => {
@@ -35,7 +37,11 @@ function setup_action_buttons(frm) {
 			if (!r.message && !frm.doc.xml_file) return;
 
 			frm.add_custom_button(__("Preview EDocument"), () => show_preview(frm), __("Actions"));
-			frm.add_custom_button(__("Validate XML"), () => validate_xml(frm), __("Actions"));
+
+			if (!is_transmitted) {
+				frm.add_custom_button(__("Validate XML"), () => validate_xml(frm), __("Actions"));
+			}
+
 			frm.add_custom_button(__("Match Document"), () => match_document(frm), __("Actions"));
 			frm.add_custom_button(
 				__("Create Document"),

edocument/edocument/doctype/edocument/edocument.json

@@ -65,7 +65,8 @@
    "in_list_view": 1,
    "in_standard_filter": 1,
    "label": "Status",
-   "options": "\nValidation Successful\nValidation Failed\nMatching Successful\nMatching Failed\nTransmission Successful\nTransmission Failed"
+   "options": "\nValidation Successful\nValidation Failed\nMatching Successful\nMatching Failed\nTransmission Successful\nTransmission Failed",
+   "read_only": 1
   },
   {
    "fieldname": "country",

edocument/edocument/doctype/edocument/edocument.py

@@ -120,6 +120,9 @@ def generate_xml(self):
 		Note: This method only generates XML - validation is handled separately.
 		This is the public method called from the button.
 		"""
+		if self.status == "Transmission Successful":
+			frappe.throw(_("Cannot regenerate XML for an already transmitted document."))
+
 		try:
 			file_name = self._generate_xml_internal()
 			# Save the document to persist status and error field changes
@@ -219,6 +222,9 @@ def validate_xml(self):
 		Updates the status and error fields based on validation results.
 		This is the public method called from the button.
 		"""
+		if self.status == "Transmission Successful":
+			frappe.throw(_("Cannot re-validate an already transmitted document."))
+
 		try:
 			self._validate_xml_internal()
 			# Save the document to persist status and error field changes
@@ -301,7 +307,17 @@ def before_save(self):
 						f"Error during automatic XML generation for EDocument {self.name}: {error_msg}"
 					)
 
-		if self.edocument_profile:
+		# Don't overwrite status for documents that reached a terminal state
+		# (already transmitted or matched) — re-validation would reset status
+		# back to "Validation Successful" and re-enable the Send button.
+		terminal_statuses = (
+			"Transmission Successful",
+			"Transmission Failed",
+			"Matching Successful",
+			"Matching Failed",
+		)
+
+		if self.edocument_profile and self.status not in terminal_statuses:
 			# Validate XML automatically
 			try:
 				self._validate_xml_internal()