Executing a statement within a stored procedure, out parameter always returns 0 - sql

Question

I need to insert some values into a table and to do this I created a stored procedure. 4 values are passed. And two values can be inserted straight into the table, for two other values an ID needs to be found.
I have three stored procedures. When I execute the main stored procedure, I can see that the two called stored procedures are executed and come up with the correct value. However this value is not passed into the parameter.
Both parameters #uid and #did retrun 0 (zero) into the table.
What am I doing wrong??
Kind regards,
Clemens Linders
SP MES_D_GetUserID, Pass a name and you gat an ID as string
SP MES_D_GetDOrderID, Pass a name and you get an ID as integer
The main stored procedure:
USE [AddOn_DEV_HE]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[MES_D_Consumed]
#WERKS nvarchar(4), #USERNAME nvarchar(50), #MACHID int, #DRINKORDER nvarchar(50)
WITH EXEC AS CALLER
AS
BEGIN
SET NOCOUNT ON;
Declare #uid AS varchar(10)
Declare #did AS int
Declare #OUTUID AS varchar(10)
Declare #OUTDID AS int
exec #uid = MES_D_GetUserID #USERNAME, #OUTUID OUTPUT;
exec #did = MES_D_GetDOrderID #DRINKORDER, #OUTDID OUTPUT;
INSERT INTO Demo_D_Consumed (Werks, UserID, MachID, DrinkID, TimeDate) VALUES (#WERKS, #uid, #MACHID, #did, GETDATE());
END
and these are the two other stored procedures :
USE [AddOn_DEV_HE]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[MES_D_GetDOrderID]
#DRINK nvarchar(50), #OUTDID int OUTPUT
WITH EXEC AS CALLER
AS
BEGIN
SET NOCOUNT ON;
SELECT RecordNr FROM DEMO_D_ORDERS WHERE Drink = #DRINK
END
USE [AddOn_DEV_HE]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[MES_D_GetUserID]
#USERNAME nvarchar(50), #OUTUID nvarchar(50) OUTPUT
WITH EXEC AS CALLER
AS
BEGIN
SET NOCOUNT ON;
SELECT UserLan FROM sysUsernames WHERE UserName = #USERNAME
END

Answer 1

Change them to be
ALTER PROCEDURE [dbo].[MES_D_GetDOrderID]
#DRINK nvarchar(50), #OUTDID int OUTPUT
WITH EXEC AS CALLER
AS
BEGIN
SET NOCOUNT ON;
SELECT #OUTDID = RecordNr FROM DEMO_D_ORDERS WHERE Drink = #DRINK
END
And
exec MES_D_GetDOrderID #DRINKORDER, #OUTDID OUTPUT;
Your #OUTDID will have the return value. Same with the other SP.