Specify asset class

What causes this issue?

To process an asset class, you have to specify the asset class.

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?

Enter an asset class key. To display or change an asset class, use the
entry help.
When you create an asset class, the asset class key has to be created
externally. It can have up to 8 characters and can be alphanumeric.

Error message extract from SAP system. Copyright SAP SE.