Hello,
1) As interest rate is not known at the moment and there is no field in interest calculation run to change interest rate, IF POSSIBLE allow tcode S_ALR_87002678 - Enter Reference Interest Values- to users to change interest rate of interest indicator which is assigned in GL master data when required. Only authorized person should be allowed to use this tcode.
*Note: This is an IMG activity.
2) If not possible, give support to client for creating interest indicator and assigning it to GL master data every time a new interest rate is to be used.
3) If client is not requiring support for this, the last resort will be manual calculation of interest and a JV will be posted for each month with reference to the loan.
Regards,
Atif Amin