When there are multiple line items in a single document need to remove payment blocks for all line items at a time .below is the process how to remove block using Mass Change option in FBL1N.
Note:payment block will come from payment terms below are the setting for default payment block
If the document is related to Vendors use -FBL1N, Customers use-FBL5N and GL use –FBL3N.
Here I am showing Vendor related document.
Go to Dynamic selection screen select document number
Click on Execute. you will see the list of document line items posted to different parties.
Got to ‘EDIT’ select all option.
System will select all line items
To remove the block click F4 for payment block field and select free for selection