Custom public transformation not executed

Hi i'm fairly new to OWB so bare with me.
I've made a custom public transformation in the OWB repository:
CREATE OR REPLACE FUNCTION DATA."DUMMY_STRING" (
"P_AUDIT_ID" IN NUMBER,
"P_PARENT_AUDIT_ID" IN NUMBER
RETURN VARCHAR2
IS
BEGIN
RETURN TO_CHAR (p_audit_id) || ' - ' || TO_CHAR (p_parent_audit_id);
END;
i use it in a process flow where i call it with AUDIT_ID and PARENT_AUDIT_ID and bind the returning value to a process flow variable V_EMAIL_MSG.
i then call another stored procedure send_mail which is stored as a project transformation(works fine by the way) where i bind the input parameter of send_mail to V_EMAIL_MSG.
all's fine so far.
when i run the flow the dummy_string function isn't executed but the send_mail procedure is???.
i've also tried to "move" dummy_string from custom public transformations into project transformations but with the same results.
could it be something about execution privileges or such??
any help would be greatly appreciated

it seems that AUDIT_ID and PARENT_AUDIT_ID are strings inside the process flow, and the dummy_string function, takes two number parameters, so what i did was to make two assignment activities(ass1, ass2), and two process flow vaiables(v_audit_id, v_parent_audit_id) as integers.
ass1 assigns AUDIT_ID to the V_AUDIT_ID variable with a to_number(AUDIT_ID) command
ass2 assigns PARENT_AUDIT_ID to the V_PARENT_AUDIT_ID variable with a to_number(PARENT_AUDIT_ID) command
in activity dummy_string i bind the v_audit_id and v_parent_audit_id variables to the two input parameters fo dummy_string, and the output of dummy_string to a v_mail_msg variable(string type) wich in tunr is bound to the input parameter of the email activity.
Does anyone know is is't possible to include images in these posts, it would sure help in illustrating warehouse builder process flows.

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