GR reversal issue using bapi BAPI_GOODSMVT_CANCEL

Hi Experts,

I have an issue,

There is a GR with material document having 2 line items for the same material number.

Both have different storage locations.

Now in my program when I am trying to reverse the GR using bapi BAPI_GOODSMVT_CANCEL, the return table displays error "Deficit of BA Unrestr. prev. 0.050 MT : CH8020203 2105 1001 AO-DPDB".

So please suggest me the solution for this.

Thanks in advance.

Sanjeev