ESS Loan Request Approver side validations

Question

Dear All,
I am using standard ess loan request service.Here I have to perform certail validations at MSS side(Loan Request Approver IView).
Here manager can edit the values of Granted Amount,payment date,payment amount and payment type.But without entering these values also the loan request is getting approved by clicking on Review button.
I want to validate the above mentioned fields in case any of thefields left blank and also I have to validate the granted amount(should not be greater than requested amount).
As we know we have following BADI's available thru which we can perform validations when employee is applying for a loan.
1.Eligibility check
2.Custom Validations
3.Determine Approver.
Is there any BADIs available to perform validations at MSS part(Loan Request Approver)
Please give some input!
Thanks,
Reddy.

Answer 1

Dear Roy,
Thanks for your response.
According to your reply I understand that I need to write my validations in the approval task(TS18900024).In the workflow Approval task there is a standard class CL_HRPBSIN_LOAN_REPAY_WF available.I cannot create a method under it since this is a standard class.Do I need to take a copy of it and create a method?
But how can I Import the parameters from approver screen like Granted amount,payment amount,payment date and payment type.
Please clarify...