- Added INumberSequenceService interface for generating document numbers.
- Created NumberSequenceService to handle atomic document number issuance.
- Introduced IPurchaseOrderService interface and implemented PurchaseOrderService for managing purchase orders.
- Added IRequisitionService interface and implemented RequisitionService for handling requisitions.
- Created IRfqService interface and implemented RfqService for managing RFQs and vendor quotations.
- Defined necessary DTOs and domain entities for procurement processes.
- Ensured proper validation and error handling across services.
ImanThiyanga
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