Step 1: Goto T-code MB51 - Add mold name and plant, click execute 

step 2: Copy Material Document number ( Movement type 561)

Step 3: Goto MIGO

Step 4: select Cancellation and then Material document  in the adjacent field and paste the copied material document number(red highlight) 

 and click execute 

Step 5: Then click ITEM OK

Step 6: Double check the mold number and plant

Step 7: SAVE

Verification

Goto MM02

Go into the mold 

Click on view Plant stock

The value should be zero