they have a custom record that is connected to their sales orders. it is connected with a parent field to the transaction. is it possible to print this in an advanced pdf?

To print fields from the linked custom record? If the custom record is stored on the Sales Order in a transaction body field, you should be able to print non-sublist fields from that record using a syntax like

$(record.custbody_custrecord.custrecord_fieldid}

@Gabriel Folstein thank you! but it does not work unfortunately..

If creating the join isn't working, you can also create a second transaction body field that sources the value from the field on the custom record

yes, but then the purpose of the custom record is gone.. we want to have the custom record to avoid creating a lot of transaction custom body fields. thank you for your help!

You sure you have the correct IDs? We have the same concept and we are able to retrieve the custom record fields using the suggested join above.

I think I typed it in a misleading way. Recordid=transaction body Field is = custom records field

@Gabriel Folstein I am not following, sorry.. We have approx 10 fields on the custom record that we want to source in to the pdf