Where to clean up a HL7 message that contains garbage

A vendor, specifically, Surgery Information Systems (SIS), is consistently sending a MDM message that has two problems.

1. unnecessary X”0D” after the TXA segment –

for example:

PID segment X”0D”

PV1 segment X”0D”

TXA segment X”0D”

X”0D”

OBX segmenr X”0D”

2. After the last OBX there are 15 “|” characters.

last OBX segment X”0D”

||||||||||||||| X”0D”

end of message

Cloverleaf seems to ignore the garbage and process the message but there are warnings in the logs that I would like to get rid of. I wrote a TPS to clean up the message and put the TPS in the Inbound Tab, TPS Inbound Data area. Is that the earliest I can put a TPS?  

It seems like even at that point Cloverleaf is looking for a valid HL7 message.

Thanks