Investment support & posted then cancelled (Please check)

What causes this issue?

You want to delete investment support key &V1&. Investment support has
already been claimed using this key, but was reversed. The investment
support measure can be deleted, but the depreciation area
remains.

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?

Confirm you want to delete the investment support measure &V1& by
pressing ENTER.

Error message extract from SAP system. Copyright SAP SE.