There is a possibility to change HU data via Functional module. Go through the instruction below:
1) Go to Transaction SE37
2) Enter FM: V51S_HU_UPDATE_DB and press F8
3) Select necessary action (Insert, Update, Delete) on apropriate level (Header or Item)
4) Enter key values and Back to previous screen
5) Save
6) Check result in tables VEKP, VEPO
