WT items could not be created

What causes this issue?

An error occurred when the <GL:inspection_sample>inspection sample</>
was put away into storage.
There are several possible causes for this error:
The <DS:GLOS.storage_unit_type>storage unit type</> is not assigned to
the storage bin.
The maximum weight for the storage bin has been exceeded.
<DS:GLOS.mixed_storage>Mixed storage</> is not allowed.
<DS:GLOS.addition_to_existing_stock>Addition to existing stock</> is not
allowed for this material.

How to fix this error?

Check your system settings.

Error message extract from SAP system. Copyright SAP SE.