diff --git a/app/config/openapi.js b/app/config/openapi.js
index 052ad08..12d0911 100644
--- a/app/config/openapi.js
+++ b/app/config/openapi.js
@@ -245,21 +245,27 @@ const purchaseOrderVendorSchema = {
     type: 'object',
     properties: {
         povId: { type: 'integer', readOnly: true },
-        povName: { type: 'string' },
-        povMailingAddress1: { type: 'string' },
-        povMailingAddress2: { type: 'string' },
-        povMailingCity: { type: 'string' },
-        povMailingState: { type: 'string' },
-        povMailingCountry: { type: 'string' },
-        povMailingZip: { type: 'string' },
-        povBillingAddress1: { type: 'string' },
-        povBillingAddress2: { type: 'string' },
-        povBillingCity: { type: 'string' },
-        povBillingState: { type: 'string' },
-        povBillingCountry: { type: 'string' },
-        povBillingZip: { type: 'string' },
-        povPhone: { type: 'string' },
-        povEMail: { type: 'string', format: 'email' },
+        // Lengths mirror purchaseordervendor.schema.js. The three
+        // NOT-NULL columns (povName, povMailingAddress1, povMailingCity)
+        // get minLength: 1; everything else is unbounded-but-capped
+        // per zod. Same pattern as Customer (#270), Company (#272),
+        // Worker (#276), BillingType+InventoryItem (#290), Job (#294),
+        // CustomerPayment (#296).
+        povName: { type: 'string', minLength: 1, maxLength: 255 },
+        povMailingAddress1: { type: 'string', minLength: 1, maxLength: 255 },
+        povMailingAddress2: { type: 'string', maxLength: 255 },
+        povMailingCity: { type: 'string', minLength: 1, maxLength: 255 },
+        povMailingState: { type: 'string', maxLength: 255 },
+        povMailingCountry: { type: 'string', maxLength: 255 },
+        povMailingZip: { type: 'string', maxLength: 32 },
+        povBillingAddress1: { type: 'string', maxLength: 255 },
+        povBillingAddress2: { type: 'string', maxLength: 255 },
+        povBillingCity: { type: 'string', maxLength: 255 },
+        povBillingState: { type: 'string', maxLength: 255 },
+        povBillingCountry: { type: 'string', maxLength: 255 },
+        povBillingZip: { type: 'string', maxLength: 32 },
+        povPhone: { type: 'string', maxLength: 64 },
+        povEMail: { type: 'string', format: 'email', maxLength: 255 },
         povCompId: { type: 'integer' },
         povArch: { type: 'boolean', readOnly: true },
     },