Assignment field during MIGO and MIRO

[shizhuoy]

Hello Experts,

When running Migo for non-stock reception, i want give a certain value for "assignement" field for the item of the related accounting document:

• GR/IR item
• Expense account Item 

When running MIRO , i want also give a certain value for "assignement" field for the item of the related accounting document except vendor item:

• GR/IR item
• Difference account
• vendor item (no need to change)

Can you tell me what is the proper way to do ? some relevant enhancement?

Thanks,