[Shopify] Do not create multiple links for the same invoice

[onbuyuka]

Fix: Duplicate document link error when posting consolidated invoice for multi-location Shopify orders

Problem

When posting a sales invoice that consolidates shipments from the same Shopify order, the system throws the error:

"The record in table Doc. Link To BC Doc. already exists. Identification fields and values: Shopify Document Type='Shopify Order' Shopify Document Id='...' Document Type='Posted Sales Invoice', Document No.='...'"

This occurs when:

• A Shopify order contains items from multiple locations
• Each location is shipped separately, creating multiple posted sales shipments
• Both shipments are combined into a single consolidated invoice using "Get Shipment Lines"

The issue is that the code iterates through all shipment lines being invoiced and attempts to insert a document link for each shipment. When multiple shipments belong to the same Shopify order, it tries to create duplicate links to the same posted sales invoice.

Solution

Before creating a new document link from a Shopify order to the posted sales invoice, the code now checks if a link already exists for that specific combination of:

• Shopify Document Type
• Shopify Document Id
• Document Type (Posted Sales Invoice)
• Document No. (Invoice number)

Only if no existing link is found will a new one be created, preventing the duplicate record error.

Work Item(s)

Fixes AB#617360