static void ExampleJob(Args _args)
{
    VendPackingSlipTrans packingSlipTrans;
    VendInvoicePackingSlipQuantityMatch VendInvoicePackingSlipQuantityMatch;
    vendInvoicetrans vendInvoiceTrans;

    select firstOnly packingSlipTrans where packingSlipTrans.RecId == 5637155083;

    select firstonly vendInvoiceTrans
    join VendInvoicePackingSlipQuantityMatch
        where VendInvoiceTrans.SourceDocumentLine == VendInvoicePackingSlipQuantityMatch.InvoiceSourceDocumentLIne
            && VendInvoicePackingSlipQuantityMatch.PackingSlipSourceDocumentLine == packingSlipTrans.SourceDocumentLine;

    info(VendInvoiceTrans.InvoiceId);

}

credited to : EYO