We receive an ask from a customer if the check boxes on transactions ‘split payment’ ‘ voluntarily’ can be enabled even on closed transactions.
This will help them to set correct markers on October data and November already. Unsettling and settling such number of transactions may cause a huge amount of user mistakes.
We can do a fix that only sysadmin user can modify it ? Or something like that ?

What is the most important right now is 2 check boxes on the vendor/customer transactions that You should update together with method of payment (I add those columns to grid for easier view).
This can be changed even after posting – those things are editable.
If this is invoice with mandatory split payment – such method should be set and split payment check box:

If this is voluntary – such method should be set, and 2 check boxes marked – split payment and voluntary split:

Method of payment setup:

Mandatory ‘SPLIT MAND’ -> payment specification with split payment check box:
Voluntary ‘SPLIT VOL’ – payment specification with split payment and voluntary split payment check boxes:

Rules under AR and AP > Setup > Payment > Split payment rules
Create vendor invoice with amount
a. for 12000
Method of payment was overwritten and on vendor transactions things has been marked as bellow
b. for 16000

Method of payment was overwritten to MAND and on vendor transactions things has been marked as bellow
SAF file – just one transaction is marked as MPP: