ALR_87011990 V/S AW01N

Dear Experts

i have been facing an big issue for last 3 days ,

Issue

After doing  AUC, Asset history sheet is showing difference in ACQUISITION  value AND APC  value without doing retirement and transfer,

T-code S_ALR_87011990

T-code AWO1N

Kindly suggest me  possible reasons

Regards

Ajeesh,s