A current standard cost estimate already exists in target system

What causes this issue?

There is already a current
<DS:GLOS.3526B6DFAFAB52B9E10000009B38F974>standard cost estimate</> in
the target system with costing variant &V1& and version &V2& in period
&V3& of fiscal year &V4& for the
<DS:GLOS.3526B6C3AFAB52B9E10000009B38F974>cost component split</> that
you want to transfer.

System Response

The cost estimate is not saved. The existing current standard cost
estimate in the target system is not overwritten.

Error message extract from SAP system. Copyright SAP SE.