Hi Lokesh,
Under below configuration path you define which document type is defaulted for PReqs with account assignment ‘F’ – created from Order.
SPRO: Plant Maintenance and Customer Service -> Maintenance and Service Processing -> Maintenance and Service Orders -> General Data -> Define Account Assignment Cat. and Document Type for Purchase Requisitions
As per standard you can defaulted only one document type per order cat. 30
In your case you need to work on some custom solution together with your developers.
Regards,
Grzegorz