.

src/api/enquiry/content-types/enquiry/schema.json

@@ -36,7 +36,7 @@
     },
     "vendor": {
       "type": "relation",
-      "relation": "oneToOne",
+      "relation": "manyToOne",
       "target": "api::vendor.vendor",
       "inversedBy": "enquiries"
     },

src/api/vendor/content-types/vendor/schema.json

@@ -70,7 +70,7 @@
     },
     "enquiries": {
       "type": "relation",
-      "relation": "oneToOne",
+      "relation": "oneToMany",
       "target": "api::enquiry.enquiry",
       "mappedBy": "vendor"
     }