When i try to add a field while modifying an existing quotation order report, receive this error:

"Please insert user defined field. Goto File > Properties > User define" (didnt find user define option)

Learnt from a forum topic that we need to add a loop before adding a field, however, while adding a loop i receive an error message to select appropriate module. i selected "sales order" module for modifying "quotation order" report.

Kindly let me know a solution. thanks!