Participation date for benefit plans

Hi friends,

We have implemented BADI- PBEN0016 for overriding participation date field .

The BADI is not working as expected when there is an increase(change) in  coverage amount. System is selecting  the old record start date for participation date whereas we need start date of new record.

For all  other scenarios badi is working as expected.

Thanks in advance

Regards

JIm