B3464: FE.type=subrecord, mode=readonly - fixed that sub form should be open...

B3464: FE.type=subrecord, mode=readonly - fixed that sub form should be open with 'formGlobalMode=readonly'

extension/Source/core/AbstractBuildForm.php

@@ -2705,9 +2705,15 @@ abstract class AbstractBuildForm {
             $queryStringArray[F_MODE_GLOBAL] = $this->formSpec[F_MODE];
         }
 
+        // In case the subrecord FE is set to 'readonly': subforms will be called with formModeGlobal=readonly
+        if ($formElement[FE_MODE] == FE_MODE_READONLY) {
+            $queryStringArray[F_MODE_GLOBAL] = FE_MODE_READONLY;
+        }
         // Add custom query parameter
         if (isset($formElement[SUBRECORD_PARAMETER_DETAIL])) {
+
             $detailParam = KeyValueStringParser::parse($formElement[SUBRECORD_PARAMETER_DETAIL]);
+
             foreach ($detailParam as $src => $dest) {
                 // Constants
                 if ($src[0] == '&') {