In CJ70 transaction , distribution rule entering option is greyed out

Hi all

In CJ70 transaction , distribution rule entering option is greyed out after our upgradation.

See in CJ70 transaction edit ->preliminary settlement >enter distribution rules option will be there in menu path. till last month we able to enter this option.after our upgradation this option greyed out.i have searched for notes.but still i couldnt found any solution.

Anybody can help on this issue???

Regards

Haran.