FM to delete Final Delivery?

What is the FM or BAPI or Class-method to delete Outbound delivery?

Below are the screen shots of manual process.

6087, 6088, 6089 and 6090 are the Outbound deliveries.

Now go to /SCWM/PRDO T-Code. and Copy the Document no. from TU screen. (679, 680, 781, 782)

Click on the advanced search and paste those in outbound delivery order fields.

Click on Advanced Search.

Now select all the records click on the outbound delivery.

Here are the outbound deliveries.

Now click on the delete button and save it.

I have tried with FM /SCWM/DLV_DELETE_WHR_PAR. It is not working.