Update src/lib/api/validations/schemas.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: lucasgoral

src/lib/api/validations/schemas.ts

@@ -18,7 +18,7 @@ export const validationSchemaProjectWorkspace = z.object({
     .max(25, t('validationErrors.max25chars')),
   displayName: z.string().optional(),
   chargingTarget: z.string().optional(),
-  chargingTargetType: z.string().optional(),
+  chargingTargetType: z.enum(['', 'btp']).optional(),
   members: z.array(member).refine((members) => members?.length > 0),
 });
 export const validationSchemaCreateManagedControlPlane = z.object({