EDI 850 B2Baddon - Multiple ISA/file and single ISA/file from same customer

Team,

Interface flow is EDI850-->Order IDoc using B2Baddon in PO. We are getting EDI 850 file from customer in two ways.

few files will have single ISA segments, few files will have multiple ISA segments. Basically they are using append option and sending EDI 850 file to us in both ways.

In EDI separator sender communication channel (Screen shot attached),

If we check the ‘Receive split ISA’ option, It is working only for file with multiple ISA segments, but not for single ISA.

If we uncheck the ‘Receive split ISA’ option, It is working only for file with single ISA segment, but not for multiple ISA.

Is there anyway to configure PO to allow both kind of files (file with multiple ISA and file with single ISA)?

We are getting this kind of files from single client so we should use single EDI separator channel.

Thanks.