Hi Pablo,
Do you want to change the item category of a line item in your sales order manually..? Is that your requirement..?
In standard configuration, its allowed when u have assigned manual selection item categories in table T184.
I think your copying control routine 151 is std, and unless it was modified, it should not cause this effect.
try with another routine, and test. Hope all other copying control routines are standard.
Regards
Jobi
