Automatic Creation of Service Entry Sheet through Maintenance Order

Hi gurus,

I am facing the situation where a client of mine works with service entry sheets.

At first they create a purcharge requisition with unknown(0) account assinment for services.After that a purcharge order is being created with the same data.

After that they create a PM Order and are executing ML81N where a Service Entry Sheet is being created an as an account assignement object they assign the specific PM Order.

They do not want to using ML81N for service entry sheet creation, but create service entry sheet from maintenance order without producing a requition.

Can anyone help?