CONVERT_TO_LOCAL_CURRENCY Error

Dear experts,

We are working on an on-going project for payroll. Previously, we have used country grouping 99 for a country which was not localized, and now we want to carry on using 99 for another country which is not localized either. We have customized the system and tables and everything is working fine, however, a new error occured. When we want to run the payroll for the old country (which was working properly), we get this error:

Error when converting a constant amount MAXBT in T511P
CONVERT_TO_LOCAL_CURRENCY has been called
Data used:
Validity end date: 28.02.2019
Constant: MAXBT
T511P currency MAD
Currency of payroll driver IQD

The new country's payroll program is working properly, and we would like to know if we can solve this issue without ABAPer. Is it possible to fix this issue?

In addition, we can't use MAXBT for both countries since their currencies are different and we can only maintain MAXBT for only 1 currency for country grouping 99. Can we do it without an ABAPer?