HELP: Post Consumption in Service Lines in Service Order


i want to ask something related to posting consume in Service Order.

let say i have a technician go to client site (so i’m using resource)

then after he get back, i have to charge customer (using service invoice), so here is the problem.

to register the cost of resource, if i post using resource it will not post the unit cost in the GL.

is there any one can provide workaround for this?