Planned qty &1 plant &2 outside of min(&3)/max(&4) value range (mat.mas.)

What causes this issue?

You set the <LS>Min/Max (Master Data)</> flag, which defines that the
system configures the calculated values for MRP parameters <LS>Minimum
Security Stock</> and <LS>Maximum Stock</> in the material master (plant
level) as the minimum/maximum values per plant.
The subsequent calculations overwrite these values, for example, because
the <LS>Fixed Item Quantity</> indicator is set.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.