No shipments specified for selection variant

What causes this issue?

You have requested transportation info for shipments. However, no
shipment entries were found in the transfer table.

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 you have used the transportation info system using function call,
use function 'SD_GTIS_SET_RECNUM' to specify valid entries in the
transfer table in advance.

Error message extract from SAP system. Copyright SAP SE.