GR based IV ticked

Dear Expert,

I have some doubt on GR based IV indicator in PO.

Let say i have 1 PO with quantity 100 ,GR based IV was ticked.

1st,i do GR 40,then proceed IR.

2nd time,i do GR 60 then i reverse 60 using mvt 122,how come system still allow to proceed IR for 60KG ?

Is it because the indicator detect GR already done for the 40KG or the 60KG eventhought it reverse after that?

Thank you.