Personal Profile - IT 2001(Time constraint Z) and table V_T7XSSPERSUBTYP

Hello Gurus,

I'm cutomizing SAP ESS Personal Profile and i have to provide infotype 2001 with specific types of absences.

Time Constraint for Infotype 2001 is "Z'.

When trying to add it to table V_T7XSSPERSUBTY(used to specify Use Cases and subtypes), the below dump occurs:

The module below is checking the settings made and time constraints for the given infotype.
The error occurs here and it makes sense, since it can't interpret "Z' as a number.

Any ideas on how to solve this?