method for it, but you can construct them explicitly with C<new_part>,
C<new_service>, and C<new_assembly>. A Buchungsgruppe should be supplied in this
case, but it will use the default Buchungsgruppe if you don't.
method for it, but you can construct them explicitly with C<new_part>,
C<new_service>, and C<new_assembly>. A Buchungsgruppe should be supplied in this
case, but it will use the default Buchungsgruppe if you don't.