Invalid sequence type specified

What causes this issue?

When you create a sequence, you must enter a sequence type. You can
choose a parallel sequence (1) or alternative sequence (2). The file
contains a number other than 1 or 2.

How to fix this error?

Make sure that the file contains either <ZH>1</> for a parallel
sequence or <ZH>2</> for an alternative sequence.

Error message extract from SAP system. Copyright SAP SE.