Line item total does not tally with account balance.

What causes this issue?

Either some documents from this account have already been archived or
one or more postings were made to the account while program RFSEPA01 was
running (to generate line items for the account).

System Response

It is not possible to convert the line items on the account into open
items.

How to fix this error?

If any documents were archived, check whether they can be retrieved into
the system.
If postings were made to the account while program RFSEPA01 was
generating line items, simply run the program again.

Error message extract from SAP system. Copyright SAP SE.