Problem with subject headers changing when replying

Problem with subject headers changing when replying

Hi, 

I have this issue when I communicate with another support center: For example:

I send email with this subject:
Problem with xx [Fwd: ##15519## : unit xx is not working] 

They respond with this subject: 
[Support #YMF-870-59464]: Problem with xx [Fwd: ##15519## :unit xx is not working] 

When I hit respond again I get this subject automatically:
Re: unit xx is not working [Request ID :##15519##]

The problem is that I then need to manually paste back the other support center's code, or a new case is opened on their end. What is causing SupportCenterPlus to strip away the other center's code, and can I change a setting to avoid this?

Cheers
Kaspar

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