Get subtypes from HR_F4_GET_SUBTYPE
We are on the latest version of SAp wherein subtypes are fetched using the Badi HR_F4_GET_SUBTYPE.
The doc seems to suggest that we can have our own coding for implementing any infotypes' subtypes.
But when I try to make an implementation for a standard infotype for which standard implementation already exists (HR_GET_SUBTYPE_T591A), I am unable to activate it saying that "implementation already exists".
How do I then get my own values for subtypes for a standard infotype like IT0006?
I don't intend to change values in T591A directly.
any suggestions would be highly appreciated..