Match one invoice across multiple purchase orders

Why

Subcontractors sometimes submit invoices that contain line items from multiple purchase orders (e.g. 5 line items from the main PO + 1 line item from the variations PO). Currently, the system can only match an invoice to a single PO.

• Currently, when an invoice is matched to two POs, it takes up the invoice/’/paid balance on both.

What

Enable users to match different line items from a single invoice to multiple purchase orders.

Only the value of the matched invoice line items should show up as invoiced or paid against the PO.

How

• Update invoice matching UI to support selecting multiple POs
• Allow users to allocate specific invoice line items to specific POs
• Only the allocated line item amounts should show against each PO (not the full invoice total)
• Update breakdown view to correctly show amounts per PO
• Ensure line item matching works across multiple POs

Dependencies

• COR-1385 Manual Line Item Matching

Acceptance Criteria

• Users can link one invoice to multiple purchase orders
• Users can allocate invoice line items to specific POs (e.g. lines 1-5 to PO A, line 6 to PO B)
• Each PO shows only the allocated line item amounts, not the full invoice total
• Breakdown percentages calculate correctly per PO (not all POs)
• All line items must be matched when splitting across multiple POs