Responsible Org unit - disappeared after Support Packs.

Hello , We have recently applied support packs on or ECC and CProjects systems and found that the feild "Responsible Org Unit" -INP_RESP_ORGU, is no longer available for input. The "Text" for the filed appears but there is no place where we can enter the Organisaional unit.

I have checked the field control and it looks fine as the fields are set to "can be displayed and "changeable with two different conditions.

any ideas?

thanks