The field & does not contain an entry; statuses & cannot be processed

What causes this issue?

If the indicator <LS><DS:DE.MD_MUSS_S>Check required fields</></> is
not set when you transfer data by
<DS:GLOS.3526B4F9AFAB52B9E10000009B38F974>direct input</> or when you
distribute data by
<DS:GLOS.3526B542AFAB52B9E10000009B38F974>Application Link Enabling</>
(ALE), the <DS:GLOS.3526C025AFAB52B9E10000009B38F974>maintenance
statuses</> &V2& are ignored in create mode if the required field &V1&
is transferred with its
<DS:GLOS.3526B2A6AFAB52B9E10000009B38F974>initial value</>.
If the field is the material group or unit of weight, and the material
is locked, you cannot extend the <LS>Purchasing</> view or the
<LS>Sales </> view. If either of these views needs to be extended, the
material must first be unlocked. This can be done only by a user with
special authorization. Contact your system administrator.
<ZH>Note</>
For information on locking and unlocking material master records, see
the SAP library documentation <LS>Material Master (LO-MD-MM)</> ->
<LS>Locking Material Master Records</>.

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?

Error message extract from SAP system. Copyright SAP SE.