Stock Posting reversal

Hi,

We have got inspection lot against PO. We have given UD & also stock posting has been done. Now Purchase Person want to cancell this posting and interested to make fresh GR against the same PO.

We are trying to cancell this GR through MIGO but in the my system we are not able to change the stock type since is shown as grey and by default it takes quality stock where as material is already posted in unrestricted stock.

Is there specific selection for executable action and referecne document.

we are taking here executable action "cancellation" and reference doc "material doc" Movement type is 106 since we have taken material through 105

Pl suggest me.

Thanks and regards,

SADAN