Stock Count - Negative stock Error when validating movement

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Hi all,

My company did Stock Count for a warehouse. When we went to validate the movement for that stock count session (Stock > Counts > Counts) , we met this error for some SKUs: "This movement cannot be performed, it generates a negative stock".

We don't find any issue with these SKUs. For example - EXR13185/1P0523-0001 the current stock number on Sage is 398.25, we did physical stock count it's 297.5. Last stock change transaction was months ago. It should be OK to validate because it wouldn't cause a negative stock. 

Could you please advise the possible cause and how we can do to solve this issue? 

Regards,

Ngoc Khong