Sales data cannot be maintained because unit of weight is lock-relevant

What causes this issue?

You have locked the material. Since the field <LS>Unit of weight</> has
been flagged in Customizing for the <LS>Material Master</> as
lock-relevant, this field can no longer be maintained after the
material is locked. As a result, sales data can no longer be created
because a unit of weight must be entered in order to create this data.

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?

If it is absolutely necessary to create sales data, unlock the material
and maintain the field <LS>Unit of weight</>. Then relock the material.
<ZH>Important</>
When a material has been locked and saved, it can be unlocked only with
a special authorization, and only if it is not used in Configuration
Management.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.