SQL0206: Column or global variable V_LPSERVER not found

My first time creating an SQL procedure using SQL logic. Can anyone help me determine where this is going south? The full error:
SQL State: 42703
Vendor Code: -206
Message: [SQL0206] Column or global variable V_LPSERVER not found. Cause . . . . . : V_LPSERVER was not found as a column of table *N in *N and was not found as a global variable in *N. If the table is *N, V_LPSERVER is not a column of any table or view that can be referenced, or V_LPSERVER is a special register that cannot be set in an atomic compound statement. Recovery . . . : Do one of the following and try the request again: -- Ensure that the column and table names are specified correctly in the statement. -- If this is a SELECT statement, ensure that all the required tables were named in the FROM clause. -- If the column was intended to be a correlated reference, qualify the column with the correct table designator. -- If the column was intended to be a global variable, qualify the name with the schema where the global variable exists or ensure the schema is in the path. -- If this is a SET statement for a special register within an atomic compound dynamic statement, remove the statement or remove the ATOMIC keyword.

I'm pretty sure I properly defined global variable V_LPSERVER.

CREATE or REPLACE PROCEDURE Read_LPARS_loop()
modifies SQL data
not deterministic
language SQL
specific AC_WRKASP
set option dbgview = *SOURCE

BEGIN
DECLARE v_LPSERVER VARCHAR(18);
DECLARE v_LPSEQUENCE INT;
DECLARE done INT DEFAULT 0;
DECLARE SQLstatement VARCHAR(1024);

-- Declare a cursor to fetch rows from the LPARS table
DECLARE c_LPARS CURSOR FOR
SELECT LPSERVER, LPSEQUENCE
FROM LPARS
order by LPSEQUENCE;

-- Declare a CONTINUE HANDLER for NOT FOUND condition
DECLARE CONTINUE HANDLER FOR NOT FOUND
SET done = 1;

-- Open the cursor
OPEN c_LPARS;

-- Loop through the LPARS rows
read_loop: LOOP
FETCH c_LPARS INTO v_LPSERVER, v_LPSEQUENCE;

IF done = 1 THEN
LEAVE read_loop;
END IF;

-- Execute the query for each LPARS row
Set SQLstatement = 'INSERT INTO qtemp/WRKASP (SELECT v_LPSEQUENCE as Seq, v_LPSERVER as Server, ASP_NUMBER, DEVD_NAME, ' ||
'100 - ( Round( DEC(DEC(TOTAL_CAPACITY_AVAILABLE, 21, 3) / DEC(TOTAL_CAPACITY, 21, 3) * 100, 21, 3), 2) ) as Pct_Used ' ||
'FROM ' || trim(v_LPSERVER) || '.qsys2.asp_info ORDER BY Asp_Number)';
EXECUTE IMMEDIATE SQLstatement ;

END LOOP;

-- Close the cursor
CLOSE c_LPARS;
END;
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