Transaction in area & contradicts the net book value rule

What causes this issue?

The document cannot be posted, as it is contrary to the net book value
rule which is checked in area &V1&.

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?

This error usually occurs when you enter proportional values. The
proportional values exceed the amount posted, for example, post
capitalization of 100 but proportional depreciation to the amount 110.
Check your entries and correct them if necessary.

Error message extract from SAP system. Copyright SAP SE.