Printing problem for the message type AUFB and MAHN

Hi MM Gurus,

We have added some text to the printout of AUFB(Remainder) and MAHN(Expediter) editing in the customized form with the help of ABAPer. We are picking the data from the NAST table to print.

Now the problem is, when we are looking the printout using printpreview option from the purchase order it looks fine as updated data is appearing in it, but when we are looking into the automatic spool request same changes are not appearing.

As per our technical consultant this is happening as the NAST table is updating after creation of spool. Is there any setting in MM so that we can update the NAST before updating the spool.

Thanks and advance.