How to initialize a variable in stored procedure with select statement - sql-server

Question

I wonder how I can directly give this variable (#p_txtValue) in the stored procedure (EXEC dbo.bisting_sp_common_Event_SetParameter) a value with a select statement without using SET statement above.
This is my code where I initialize #l_txtTemp with a SET statement then the give #p_txtValue the value from it.
SELECT
ssh.No_
,ssh.[Bill-to Customer No_]
,RANK () over (ORDER BY ssh.No_) Rank_Id
INTO #shipments --DROP TABLE #shipments
FROM dbo.[Production$Sales Shipment Header] SSH
WHERE SSH.[Sell-to Customer No_] IN ('3004', '3003', '3002')
AND ssh.[Posting Date]>'2015-10-01'
AND NOT EXISTS (SELECT *
FROM dbo.[bisting System Monitor] tSub1
WHERE tSub1.[Row Type] = 'Log'
AND tSub1.[Type] ='Checkpoint Init'
AND tSub1.[Master Event Type] = #l_txtCurrMasterEventType
AND tSub1.[Document No_] = ssh.No_)
SELECT #l_intRankIDCurr = 1, #l_intRankIDMax = (SELECT MAX(Rank_Id) FROM #shipments)
WHILE (#l_intRankIDCurr <= #l_intRankIDMax)
BEGIN
SELECT #l_txtShipmentNo = No_
FROM #shipments WHERE Rank_Id = #l_intRankIDCurr
SET #l_txtTemp = CASE (SELECT t1.[Bill-to Customer No_]
FROM #shipments t1
WHERE t1.Rank_Id = #l_intRankIDCurr)
WHEN '3002' THEN 'Uppsala.csv'
WHEN '3003' THEN 'Gränby.csv'
WHEN '3004' THEN 'Örebro.csv'
END
IF #p_intLogLevel >= 4 PRINT CONVERT(VARCHAR(19),CURRENT_TIMESTAMP,121)+': Create set document no parameter'
EXEC dbo.bisting_sp_common_Event_SetParameter #p_bigintEventID=#l_bigintChildEventID
,#p_txtAttributeLvl1='Action SP Filename'
,#p_txtValue= #l_txtTemp
SELECT #l_intRankIDCurr += 1
END
Is it possible to make something like this? this example below didn't work for me neither the other ones i tried:
IF #p_intLogLevel >= 4
PRINT CONVERT(VARCHAR(19),CURRENT_TIMESTAMP,121)+': Create set document no parameter'
EXEC dbo.bisting_sp_common_Event_SetParameter
#p_bigintEventID = #l_bigintChildEventID
,#p_txtAttributeLvl1 = 'Action SP Filename'
,#p_txtValue = (SELECT [Attribute]
FROM [TABLE] t1
WHERE t1.Rank_Id = #l_intRankIDCurr)

Answer 1

Only way is:
declare #p_txtValue nvarchar(max) =
(SELECT [Attribute] FROM [TABLE] t1 WHERE t1.Rank_Id = #l_intRankIDCurr)
and:
EXEC dbo.bisting_sp_common_Event_SetParameter ....#p_txtValue = #p_txtValue
because of:
[ [ #parameter = ] { value
| #variable [ OUTPUT ]
| [ DEFAULT ]
}
that means that you can pass directly string 'somevalue' or with a variable.