The field BUKRS (company code) does not exist in your structure!

What causes this issue?

The field BUKRS is not available in your communication structure.

System Response

If you wish to update your information structure using the period unit
posting period, then the field BUKRS (company code) is required in the
communication structure.
The company code is used to determine the fiscal year variant.
The fiscal year variant can, however, also be pre-set when the
information structure is activated.

How to fix this error?

If you do <ZH>not</> wish to update your information structure on the
basis of the posting period, then please ignore this warning
message.
Otherwise, insert the field BUKRS with the data element of the same name
into your communication structure.
If, however, you add the field BUKRS to your communication structure at
a later stage, you do not need to change or recreate the LIS inbound
interface.

Error message extract from SAP system. Copyright SAP SE.