Mass Print Sales Orders

Hello,

I need to mass print sales orders.

Upon trying to use program SD70AV1A using the following settings:

Output Type                       Z***

Transmission Medium         1

Sort order                           01

Processing mode                1           (I have tried 2 and 3 also)

Sales Document                 *****

Sales Organization              ***

I receive a status saying that there are no messages to be printed.

I have read that this method will not work if the output type is not already defined in the sales order.

How can I mass populate the output type in the sales order so I can use this program?

I have also read that the program RSNAST00 may be used in this instance using output application 'V1' (for sales).

In trying to use this program I also receive a status saying that there are 0 outputs processed.

I have tried variations on the object key (Sales order number, Sales order number with leading zeros, sales order number concatenated with item number, sales order number concatenated with item number with leading zeroes) all to no avail.

What am I doing wrong? How can I mass print sales orders?

Thanks.

N.B. Processing them one by one in VA02 works as it should.