system generate service order while create repair order in repair process

Dear expert,

I need your help to resolve my Issue.

Issue is whenever I create Notification for Repair that time system created service order along with Repair order in Background I don't know why ? actually service order should not create that time which is wrong.

Then Again system generate Service order after receive Repair material from customer that is correct and its should be generate.

below is a screen short of document flow for your better understand.

Kindly help me to resolve this issue. Thanks in advance.

Regards,

Manzoor