fix(Contacts): validate contact associated transcations.

server/src/interfaces/SaleEstimate.ts

@@ -32,4 +32,12 @@ export interface ISaleEstimateDTO {
 
 export interface ISalesEstimatesFilter extends IDynamicListFilterDTO { 
   stringifiedFilterRoles?: string,
+}
+
+
+export interface ISalesEstimatesService {
+  validateCustomerHasNoEstimates(
+    tenantId: number,
+    customerId: number,
+  ): Promise<void>;
 }