Substitution rule: ania-aktiv with proj-plsez(t-code: CJ20N)

Hi,

I am trying to create a substitution rule in transaction OPSN. On project save ania-aktiv is to be substituted with proj-plsez based on a condition in t-code: CJ20N.

I am aware of the client specific user exits and i have successfully set substitution rule for another field( Copying standard program into a custom program and setting the configuration in SPRO).

I am facing problem to set substitution rule for ania-aktiv as these fields are not available in the exit. I could populate only PRPS and PROJ fields and not ANIA fields.

Can any one please give a solution for this.

Thanks in advance