Dynamics GP - The sales distribution amount is incorrect

Problem:
You get this error even if you default the distributions correctly.

Solution:
this is happening because the MRKDNAMT and ORMRKDAM fields do not match the total markdown for all the line items.
This generally occurs if the transaction has been imported, and the MRKDNAMT field has been set.

To resolve this issue, default the distributions, and note the total markdown amount.
Run this script and set the fields to the correct markdown amount

update SOP10100 set MRKDNAMT = 1.25,ORMRKDAM = 1.25  where SOPNUMBE = 'inv00012'