Error scalar type is not allowed:

Hello togehter,

im build up a prozedure and want to create it. But ther comes en error

Could not execute 'CREATE PROCEDURE <schmea_name>.UPSERT_TABLE (IN p_source_schema_name NVARCHAR(200), IN ...' in 125 ms 195 µs .

SAP DBTech JDBC: [1310] (at 3269): scalar type is not allowed: line 81 col 7 (at pos 3269)

In this line i had declar a cursor:

CURSOR source_tableFOR

SELECT column_name,

data_type_name,

length,

scale,

is_nullable

FROM  :v_source_schema_tablename_variable_stmt

the variable is

v_source_schema_tablename_variable_stmt NVARCHAR(250) := :p_source_schema_name || '.' || :p_source_table_name;

thx for your help