Cancel the quality inspection movement on good receipt

I am trying to cancel a quality inspection movement from qual. Inspect. to

unrestricted use. Here are the details:

1. A goods receipt was entered for Material XXX batch YYY for

1900kg. It was entered Aug 1, but was backdated to post on July

29.

2. I think an accident was made and the person

entered the good receipt into quality inspection status, rather than in unrestricted

use.

3. this person used the movement 321 without success .

4. Now it will not allow me to post goods issue with a back date of Friday

July 29.

When i try to reseverse the good recipt i received an error message Deficit of BA Stck.in qual.insp 1.900 KG

Message no. M7021.

Can you help me?

Thanks in advance