Sending company code & is not assigned to a cross-system company code

What causes this issue?

You want to enter line items for foreign company codes. It is essential
here that the company code &V1& which serves as a sending company code,
is allocated to a cross-system company code.

System Response

The entry of line items for foreign company codes is rejected.

How to fix this error?

If your entries were incorrect, correct them, otherwise contact the
system administrator in order to allocate a <ZH>cross-system company
code</> to the company code &V1&.
<ZH>Procedure for the system administrator</>
Allocate a cross-system company code to the company code &V1&.
<DS:TRAN.OBY6>Proceed</>

Error message extract from SAP system. Copyright SAP SE.