Infotype 1050 is not activated see t77s0

Hello.

We recently upgrade our system to EHP5 and detect the following error wher creating a new position in transaction PP03. The information message is "Infotype is not activated --> see t77s0 "

I have taken a look to this table but I do not find any kind pf parameters where activated any infotype.

Could you please help me with this?

Thank you very much!