Passing multiple values to parameters from an existing table - sql-server

Question

I am trying to create a stored procedure which passes values from select statement of joined tables as parameters to another stored procedure inside to create return credit for returned purchase which are assigned in the WHERE clause of joined tables (#RANO and #returndate). I want to pass many customers (as #Customer) from the joined tables to the stored procedure CreateManCreditHDFromReturn but it picks the first #RANO in the WHERE clause of the joined statement!
How can I pass multiple values (like customers, divisions,...) from all RANOs in the where clause of the joined table?
Note: RANO mean return authorization of returned purchase.
ALTER PROCEDURE [dbo].[CreateEllieAutoCreditHDFromReturn]
AS
BEGIN
DECLARE #ARReason nVarChar(5),
#DocumentDate Datetime,
#ARDocumentType VarChar(5),
#TRANSACTIONID INT,
#TIMELASTMOD DATETIME,
#USERIDLASTMOD nvarchar(5),
#CompanyCode nVarChar(10),
#Customer nVarChar(10),
#Division nVarChar(5),
#Warehouse nVarChar(10),
#Salesman1 nVarChar(10),
#Currency nVarChar(3),
#ReturnNo int,
#RANO int,
#Style nvarchar(15),
SELECT #Pkey = #CompanyCode = rh.companycode,
#Customer = rh.CUSTOMER,
#Division = rh.DIVISION,
#Warehouse = rh.WAREHOUSE,
#Salesman1 = rh.SALESMAN1,
#Currency = rh.CURRENCY,
#ReturnNo = rh.returnno,
#RANO = rh.RANO
FROM
ReturnDetail rd
INNER JOIN
ReturnHeader rh ON rh.RETURNNO = rd.RETURNNO
WHERE
rh.RETURNDATE >= '2020-03-27 00:00:00'
AND rh.RETURNDATE < '2020-03-28 00:00:00'
AND rd.RANO IN (79383, 79820)
AND rd.ARDOCUMENTNOCOMPANY = 0
SET #ARReason = 'RM'
SET #ARDocumentType = 'RCRDT'
SET #DocumentDate = GETDATE()
SET #TRANSACTIONID = 0
SET #TIMELASTMOD = GETDATE()
SET #USERIDLASTMOD = 'WSchan'
SET #ReferenceNo = 0
DECLARE #CurrDocumentNo Int,#CurrDocumentNoCompany Int
EXEC dbo.CreateManCreditHDFromReturn
#CompanyCode,
#ARReason,
#Customer,
#Division,
#Warehouse,
#Salesman1,
#Currency,
#DocumentDate,
#ReferenceNo,
#ARDocumentType,
#CurrDocumentNo OUTPUT,
#CurrDocumentNoCompany OUTPUT,
#TRANSACTIONID,
#TIMELASTMOD,
#USERIDLASTMOD
END

Answer 1

You can't assign multiple values to scalar variables. If you are restricted in that you have no access to modify dbo.CreateManCreditHDFromReturn then you have to use a cursor or loop and iterate through each record in your query. The stored procedure is coded to accept one value at a time for its input parameters.
If you have the ability to modify dbo.CreateManCreditHDFromReturn then you can update it to accept a table variable, JSON, or XML and then inside that stored procedure you can unpack the input and process it accordingly.
If you have to use a cursor, which I'm guessing is going to be the case, it would look something like this:
DECLARE #CompanyCode NVARCHAR(10);
[...and other variables...]
DECLARE RANOCURS CURSOR FOR
SELECT CompanyCode, [...and other fields...]
FROM ReturnDetail rd
INNER JOIN ReturnHeader rh ON rh.RETURNNO = rd.RETURNNO
WHERE rh.RETURNDATE >= '2020-03-27 00:00:00'
AND rh.RETURNDATE< '2020-03-28 00:00:00'
AND rd.RANO IN (79383, 79820)
AND rd.ARDOCUMENTNOCOMPANY = 0;
OPEN RANOCURS;
FETCH NEXT FROM RANOCURS INTO #CompanyCode, [...other variables...]
DECLARE #CurrDocumentNo INT, #CurrDocumentNoCompany INT;
WHILE ##FETCH_STATUS = 0
BEGIN
EXEC dbo.CreateManCreditHDFromReturn
#CompanyCode ,
[...other variable parameters...],
#CurrDocumentNo OUTPUT,
#CurrDocumentNoCompany OUTPUT;
[...do something with the return values...]
FETCH NEXT FROM RANOCURS INTO #CompanyCode, ...[other fields]
END;
CLOSE RANOCURS;
DEALLOCATE RANOCURS;