Te quedo algo así ??
SELECT
T0.[CardCode]
,T0.[CardName]
,T0.[DocDate]
,T0.[CreateDate]
,'FACTURA' as Documento
,T0.[DocNum]
,T2.[ItemCode]
,T2.[Dscription]
,T2.[Quantity]
,T2.[Price]
,T2.[LineTotal]
,T4.[SlpName]
,T5.[firstName]
,T5.[lastName]
, T6.[PymntGroup]
, T0.[DiscPrcnt]
FROM OINV T0 INNER JOIN OCRD T1 ON T0.CardCode = T1.CardCode INNER JOIN INV1 T2 ON T0.DocEntry = T2.DocEntry
INNER JOIN OITM T3 ON T2.ItemCode = T3.ItemCode
INNER JOIN OSLP T4 ON T0.SlpCode = T4.SlpCode
INNER JOIN OHEM T5 ON T0.OwnerCode = T5.empID
INNER JOIN OCTG T6 ON T0.GroupNum = T6.GroupNum where T0.[CreateDate] between '01/01/2015' and '12/31/2015'
Union all
SELECT
T0.[CardCode]
,T0.[CardName]
,T0.[DocDate]
,T0.[CreateDate]
,'NC'
,T0.[DocNum]
,T2.[ItemCode]
,T2.[Dscription]
,T2.[Quantity]
,T2.[Price]
,T2.[LineTotal]
,T4.[SlpName]
,T5.[firstName]
,T5.[lastName]
,T6.[PymntGroup]
,T0.[DiscPrcnt]
FROM ORIN T0 INNER JOIN OCRD T1 ON T0.CardCode = T1.CardCode
INNER JOIN RIN1 T2 ON T0.DocEntry = T2.DocEntry
INNER JOIN OITM T3 ON T2.ItemCode = T3.ItemCode
INNER JOIN OSLP T4 ON T0.SlpCode = T4.SlpCode
INNER JOIN OHEM T5 ON T0.OwnerCode = T5.empID
INNER JOIN OCTG T6 ON T0.GroupNum = T6.GroupNum where T0.[CreateDate] between '01/01/2015' and '12/31/2015'
Desde Villavicencio Colombia
Ariel Plata