Hi ​@Shanuka Lashan,

The purpose of the functionality is to post a voucher to recognise accrued revenue for reported not invoiced transactions as part of period end reporting. The voucher is automatically reversed on the first day of the following period, so will only impact values for the specific period.

There is some more info in the documentation here (this is for 25R1, but this particular functionality has not changed since Apps 10): 

https://docs.ifs.com/ifsclouddocs/25r1/lang/en/ProjectReporting/ActivityExecuteWIP.htm?StandAlone=true

Hope this helps.

Kind regards,
Johan