MERGEFIELD of PURCHASE -> Adding Invoicing & Receiving Number

The field - "Invoicing and Receiving Number" is critical for Advance Purchase Orders that the goods receive is separated into multiple times. Now it is not listed in the document mergefield so it cannot be printed on any documents and our warehouse cannot know which batch of the goods are going to be received.

The "Invoicing and Receiving Number" is already in the API so we need the Mergefield in sync on workflow.