fix: MFE - custom link creation

packages/nc-gui/components/smartsheet/details/Fields.vue

@@ -514,7 +514,10 @@ const isColumnValid = (column: TableExplorerColumn) => {
     return false
   }
   if ((column.uidt === UITypes.Links || column.uidt === UITypes.LinkToAnotherRecord) && isNew) {
-    if (!column.childColumn || !column.childTable || !column.childId) {
+    if (
+      (!column.childColumn || !column.childTable || !column.childId) &&
+      (!column.custom?.ref_model_id || !column.custom?.ref_column_id)
+    ) {
       return false
     }
   }