Variable installments are not working for GLIM Loan accounts

For GLIM Loan accounts it is possible to modify schedule during the loan creation but after creating loan, changes disappears.

1. Enable LSIM, GLIM and Variable Installments for Group Loan product with Flat/Declining Balance interest rate type.
2. Start creating GLIM Loan account.
3. Select at least 2 customers.
4. On page with schedule, modify some dates and amounts.
5. Click continue and notice that changes are visibile in the schedule on 'Review&Submit' page.
6. Click Submit button.
7. On Group Loan details page, click on 'Repayment Schedule' link.

Expected result:
Repayment schedule has the same dates and amounts as during the loan creation (including modified values).

Actual result:
Repayment schedule has the dates and amounts before modification (the same as when Variable Installments option is turned off).