Response DueBy Time do not change when sending e-mail

Response DueBy Time do not change when sending e-mail

Hello, 

Tried to google but didn't find anything useful. 

What happens: 
Requester e-mails the servicedesk, a ticket is created and the Response DueBy Time is set as it should. 
The technician replies to the requester for more information and sets the status to waiting, Response DueBy Time is still the same

What I want: 
Requester e-mail the servicedesk,  a ticket is created  and the Response DueBy Time is set as it should. 
The technician replies to the requester for more information and sets the status to waiting, Response DueBy Time is cleared

Is this a bug or a setting ? 

KR
Daniel 

Your Version: 10.5 Build 10526
Database:  postgres 

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