La consulta calculada con alias de QISProduct contiene la columna de identificación de dos tablas, es decir, QISEventLog y QISProcess. Así que cambie el nombre de esas columnas a diferentes nombres. Consulta actualizada
SELECT g.artcode
,sum(g.aantal)
,i.class_01
,i.Isstockitem
FROM gbkmut AS g
INNER JOIN items AS i ON i.itemcode = g.artcode
INNER JOIN (
SELECT QISP.id
,QISprocess.nml AS Processnml
,QISeventlog.id AS EventLogId
,QISeventlog.dtsample
,QISproduct.nms
,QISbatchlog.nm AS batchnm
,QIStestlog.idvariable
,QIStestlog.no
,QISshortnote.ds
,gewicht = CASE QIStestlog.IDvariable
WHEN '139'
THEN QIStestlog.no
END
,aantal = CASE QIStestlog.IDvariable
WHEN '234'
THEN QIStestlog.no
END
,siloleeg = CASE QIStestlog.idvariable
WHEN '23'
THEN CASE QIStestlog.no
WHEN '10'
THEN 'Ja'
ELSE 'Nee'
END
END
,QISvariable.nml variablenml
,gl.nm AS glnm
,QISprocess.id AS ProcessId
FROM QIC.Vobra_new2.dbo.production AS QISP
INNER JOIN QIC.Vobra_new2.dbo.process AS QISprocess ON QISP.idprocess = QISProcess.id
INNER JOIN QIC.Vobra_new2.dbo.product AS QISproduct ON QISP.idproduct = QISproduct.id
INNER JOIN QIC.Vobra_new2.dbo.batchlog AS QISbatchlog ON QISP.idbatch = QISbatchlog.id
INNER JOIN QIC.Vobra_new2.dbo.eventlog AS QISeventlog ON QISeventlog.idproduction = QISP.id
AND QISeventlog.idbatch = QISbatchlog.id
INNER JOIN QIC.Vobra_new2.dbo.testlog AS QIStestlog ON QIStestlog.idevent = QISeventlog.id
LEFT JOIN QIC.Vobra_new2.dbo.shortnote AS QISshortnote ON QISshortnote.id = QIStestlog.no
AND QIStestlog.idvariable = '144'
INNER JOIN QIC.Vobra_new2.dbo.variable AS QISvariable ON QISvariable.id = QIStestlog.idvariable
LEFT JOIN QIC.Vobra_new2.dbo.vvarxproc AS vvp ON vvp.idvariable = QISvariable.id
AND vvp.idprocess = QISP.idprocess
LEFT JOIN QIC.Vobra_new2.dbo.attribute AS QISattribute ON QISattribute.id = vvp.idattribute
LEFT JOIN QIC.Vobra_new2.dbo.grade AS QISgrade ON QISgrade.id = QISattribute.idgrade
LEFT JOIN QIC.Vobra_new2.dbo.gradelevel AS gl ON gl.idgrade = QISattribute.idgrade
AND gl.nlevel = QIStestlog.no
WHERE QISbatchlog.nm NOT LIKE 'V%'
AND QISP.dtstart > '2017-01-01'
AND QISP.dtstart < '2017-01-19'
AND QISP.idprocess IN (
'12'
,'13'
,'14'
,'15'
,'16'
,'17'
,'18'
,'41'
)
AND QIStestlog.idvariable IN (
'234'
,'139'
,'128'
)
) QISproduct ON g.artcode = QISproduct.nms
WHERE g.bkjrcode > '2015'
AND g.reknr IN (
3000
,3010
,3020
)
AND g.aantal > 0
AND g.warehouse IN (
'1'
,'9'
)
AND g.datum >= '2017-01-01'
AND g.oorsprong = 'R'
AND g.kstplcode <> 'VPR'
GROUP BY g.artcode
,i.Class_01
,i.IsStockItem
