HRMD_A idoc overwrites record in IT22-LSMW

Hi,

Please, could someone guide regarding the below issue;

We have created LSMW using Idoc method for updating IT0022(education record).

However, the issue is that HRMD_A idoc overwrites records within the same validity time though it has time constraint '3'.

.Whereas we can create this through PA30.

for ex; If there is an existing record from 01.01.2012-30.01.2012. Now if the idoc has a record with same date it overwrites the existing record.Whereas through PA30 we can update this & hence overview will show 2 records with dates 01.01.2012-30.01.2012.

Has anyone faced a similar issue?

Appreciate your help on this issue.

Regards,

Sarika