Hi,
In the ouput determination configuration, check the output type setting for application V1
check in SPRO --> Sales & distribution --> basic functions --> output control --> output determination using condition technique --> maintain output determination for sales documents --> maintain output type
Select your output type and see if program and form routine are assigned or not.
The message VN 056 is coming out of std SAP output program - RSNAST00
regards,
Vaibhav kulkarni.