Voucher Build - Voucher created via Voucher build for dsitribution Line

We are loading the VCHR_HDR_STG and VCHR_LINE_STG tables to created vouchers from a third party system.  We are not loading the VCHR_DIST_STF table because we are tryign to get it to populate the distribution line information via the voucher build process. 

Has anyone done this delviered or will it have to be a custom process?

Thanks.