hi,
As mentioned in replies above ,it is always advisable and preferred to check the actual cost per line item report (CJI3)
check the WBS element ,and the document number against it
click on the document number you shall have positive and negative entries
positive entries shall be over to the account assignment such as asset or WBS element over to which values are settled
negative values shall be over to the initial account assignment. thus making and displaying the values as zero.
This way you can check the entire documents and the value