Conversion from BUoM &1 into contract unit of measure &2 failed.

What causes this issue?

The automatic creation of the purchase order failed. It was not
possible to convert the assigned quantity into the purchase order unit
of measure (same unit of measure as in the assigned purchase contract).

How to fix this error?

Please check:
- Whether or not the correct units of measure are being used
- Whether or not the conversion between the base unit of measure and
thecontract unit of measure has been maintained.

Error message extract from SAP system. Copyright SAP SE.