Reg: PPM to PS Integration , Fields passing from PPM to PS as # instead of Values

HI Team,

In one of my Scenario of PPM to PS Integration, Data is passing from PPM to PS,  But while passing/saving the data from PPM to PS (Table PROJ in PS System), Some fields are getting as Blank insteadf of Values irrespective if whether values are there or not in the PPM fields.

What will be the reasons?

And how can i see where the data from PPM to PS is flowing, I mean through debugging where can i see the data flow from PPM to PS ?

Please sugest your ideas on this

Thanks,

Karthik.S