Full product &: unit & cannot be converted to stockkeeping unit &

What causes this issue?

An error occured during quantity conversion for full product &V1& from
the<GL:stockkeeping_unit>stockkeeping unit</> into the alternative unit
of measure.

System Response

The system cannot post the document.

How to fix this error?

INCLUDE ISR_SYSTEMFEHLER

Error message extract from SAP system. Copyright SAP SE.