The system was able to copy & out of & items

What causes this issue?

The material document you have selected already contains items that
have been reversed. These items are not included in the current
selection list.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Please check whether you have chosen the correct material number.
If so, you can post the selected items.
Otherwise, choose the function "Cancel" and enter the desired
material number in the dialog window. (Choose this window from the menu
bar with 'Material document - Reference...').

Error message extract from SAP system. Copyright SAP SE.