User Exit for IW32 accessrights check on fields

Hello,

i need to implement a check that enables me to block the access on a column within the table (transaction IW32) at the objects-tab for users of a specific role.

That check could be done by showing an error message once the user presses SAVE or by blocking the input in that table. I checked the Userexit EXIT_SAPLCOIH_009 but that one only allows a check on the header data not on the data of the objects-tab.

I hadnt found any other user exit that could do the trick. Is that only possible by SAP-code manipulation ?

Could somebody help me out here ?

Thanks and best regards,

oliver