Documents manually posted within dep.doc.number range

What causes this issue?

In the number range interval for the document type for posting
depreciation, a document &V1& has been posted which was not created
within the framework of depreciation posting. The last document posted
by depreciation posting was assigned the number &V2&.

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?

Contact your Systems Specialist. When changing the number range
interval for the document type in depreciation posting, you have to
specify a new interval in which no documents exist. Using
organizational measures, you can guarantee that there are no documents
apart from those created by depreciation posting in this number range.

Error message extract from SAP system. Copyright SAP SE.