Error: TA in Buffer too Long

Symptom

 transport in buffer too long or unknown format detected

Solution

1. Check your buffer file using below command and make sure everything is okay.

tp showbuffer <SID> pf=<TP-DOMAIN-PROFILE>

2. The result should be like this.

 that makes 100 transports to be imported.

tp finished with return code: 0
meaning:
  Everything OK

3. If not okay, you can mv the buffer as per below. The new buffer will automatically generated.

mv <SID> <SID>.OLD

Reference:
SAP Note 89625