Oracle to PSQL function

Hi

I am trying to do an upgrade on an open source app called adempiere The problem I have is that the 
original scripts are for Oracle and I am trying to run it on a PostgreSQLl data base

I am having a problem converting  the 007_ProductAttribute.sql script. See below
I am getting the following error.  
 
ERROR: syntax error at or near "v_Name" 
SQL state: 42601 
Character: 1263 

I have tried all kinds of variations
RETURNS VARCHAR(2) 
AS 'v_Name
....................
WHERE ai.M_AttributeSetInstance_ID=p_M_AttributeSetInstance_ID;' 
BEGIN 


RETURNS VARCHAR(2) 
AS "v_Name
....................
WHERE ai.M_AttributeSetInstance_ID=p_M_AttributeSetInstance_ID;" 
BEGIN 

but none seem to work

I am looking for an on line help with loads of examples for PSQL 
specifically in regards to stored procedures or functions.

The following does not help me much.
http://www.postgresql.org/docs/8.2/interactive/sql-createfunction.html

any help would be appreciated

Thank you



007_ProductAttribute.sql
==================
CREATE OR REPLACE FUNCTION productAttribute
(
    p_M_AttributeSetInstance_ID     IN NUMBER
)
RETURN VARCHAR2
AS
    v_Name          VARCHAR2(2000) := NULL;
    v_NameAdd       VARCHAR2(2000) := '';
    --
    v_Lot           M_AttributeSetInstance.Lot%TYPE;
    v_LotStart      M_AttributeSet.LotCharSOverwrite%TYPE;
    v_LotEnd        M_AttributeSet.LotCharEOverwrite%TYPE;
    v_SerNo         M_AttributeSetInstance.SerNo%TYPE;
    v_SerNoStart    M_AttributeSet.SerNoCharSOverwrite%TYPE;
    v_SerNoEnd      M_AttributeSet.SerNoCharEOverwrite%TYPE;
    v_GuaranteeDate M_AttributeSetInstance.GuaranteeDate%TYPE;
    --
    CURSOR CUR_Attributes IS
        SELECT ai.Value, a.Name
        FROM M_AttributeInstance ai
          INNER JOIN M_Attribute a ON (ai.M_Attribute_ID=a.M_Attribute_ID AND a.IsInstanceAttribute='Y')
        WHERE ai.M_AttributeSetInstance_ID=p_M_AttributeSetInstance_ID;

BEGIN
/*    --  Get Product Name
    SELECT Name 
      INTO v_Name
    FROM M_Product WHERE M_Product_ID=p_M_Product_ID;
*/
    --  Get Product Attribute Set Instance
    IF (p_M_AttributeSetInstance_ID > 0) THEN
        SELECT asi.Lot, asi.SerNo, asi.GuaranteeDate,
            COALESCE(a.SerNoCharSOverwrite, TO_NCHAR('#')), COALESCE(a.SerNoCharEOverwrite, TO_NCHAR('')),
            COALESCE(a.LotCharSOverwrite, TO_NCHAR('�')), COALESCE(a.LotCharEOverwrite, TO_NCHAR('�'))
          INTO v_Lot, v_SerNo, v_GuaranteeDate,
            v_SerNoStart, v_SerNoEnd, v_LotStart, v_LotEnd
        FROM M_AttributeSetInstance asi
          INNER JOIN M_AttributeSet a ON (asi.M_AttributeSet_ID=a.M_AttributeSet_ID)
        WHERE asi.M_AttributeSetInstance_ID=p_M_AttributeSetInstance_ID;
        --
        IF (v_SerNo IS NOT NULL) THEN
            v_NameAdd := v_NameAdd || v_SerNoStart || v_SerNo || v_SerNoEnd || ' ';
        END IF;
        IF (v_Lot IS NOT NULL) THEN
            v_NameAdd := v_NameAdd || v_LotStart || v_Lot || v_LotEnd || ' ';
        END IF;
        IF (v_GuaranteeDate IS NOT NULL) THEN
            v_NameAdd := v_NameAdd || v_GuaranteeDate || ' ';
        END IF;
        --
        FOR a IN CUR_Attributes LOOP
            v_NameAdd := v_NameAdd || a.Name || ':' || a.Value || ' ';
        END LOOP;
        --
        IF (LENGTH(v_NameAdd) > 0) THEN
            v_Name := v_Name || ' (' || TRIM(v_NameAdd) || ')';
        END IF;
    END IF;
    
    RETURN v_Name;
END productAttribute;


New 007_ProductAttribute.sql
======================


CREATE OR REPLACE FUNCTION adempiere.productAttribute
(
    p_M_AttributeSetInstance_ID     IN NUMBER
)
RETURN VARCHAR

AS
    v_Name          VARCHAR(2000) := NULL;
    v_NameAdd       VARCHAR(2000) := '';
    --
    v_Lot           M_AttributeSetInstance.Lot%TYPE;
    v_LotStart      M_AttributeSet.LotCharSOverwrite%TYPE;
    v_LotEnd        M_AttributeSet.LotCharEOverwrite%TYPE;
    v_SerNo         M_AttributeSetInstance.SerNo%TYPE;
    v_SerNoStart    M_AttributeSet.SerNoCharSOverwrite%TYPE;
    v_SerNoEnd      M_AttributeSet.SerNoCharEOverwrite%TYPE;
    v_GuaranteeDate M_AttributeSetInstance.GuaranteeDate%TYPE;
    --
    CURSOR CUR_Attributes IS
        SELECT ai.Value, a.Name
        FROMadempiere. M_AttributeInstance ai
          INNER JOIN adempiere.M_Attribute a ON (ai.M_Attribute_ID=a.M_Attribute_ID AND a.IsInstanceAttribute='Y')
        WHERE ai.M_AttributeSetInstance_ID=p_M_AttributeSetInstance_ID;

BEGIN
/*    --  Get Product Name
    SELECT Name 
      INTO v_Name
    FROM M_Product WHERE M_Product_ID=p_M_Product_ID;
*/
    --  Get Product Attribute Set Instance
    IF (p_M_AttributeSetInstance_ID > 0) THEN
        SELECT asi.Lot, asi.SerNo, asi.GuaranteeDate,
            COALESCE(a.SerNoCharSOverwrite, TO_NCHAR('#')), COALESCE(a.SerNoCharEOverwrite, TO_NCHAR('')),
            COALESCE(a.LotCharSOverwrite, TO_NCHAR('�')), COALESCE(a.LotCharEOverwrite, TO_NCHAR('�'))
          INTO v_Lot, v_SerNo, v_GuaranteeDate,
            v_SerNoStart, v_SerNoEnd, v_LotStart, v_LotEnd
        FROM adempiere.M_AttributeSetInstance asi
          INNER JOIN adempiere.M_AttributeSet a ON (asi.M_AttributeSet_ID=a.M_AttributeSet_ID)
        WHERE asi.M_AttributeSetInstance_ID=p_M_AttributeSetInstance_ID;
        --
        IF (v_SerNo IS NOT NULL) THEN
            v_NameAdd := v_NameAdd || v_SerNoStart || v_SerNo || v_SerNoEnd || ' ';
        END IF;
        IF (v_Lot IS NOT NULL) THEN
            v_NameAdd := v_NameAdd || v_LotStart || v_Lot || v_LotEnd || ' ';
        END IF;
        IF (v_GuaranteeDate IS NOT NULL) THEN
            v_NameAdd := v_NameAdd || v_GuaranteeDate || ' ';
        END IF;
        --
        FOR a IN CUR_Attributes LOOP
            v_NameAdd := v_NameAdd || a.Name || ':' || a.Value || ' ';
        END LOOP;
        --
        IF (LENGTH(v_NameAdd) > 0) THEN
            v_Name := v_Name || ' (' || TRIM(v_NameAdd) || ')';
        END IF;
    END IF;
    
    RETURN v_Name;
END adempiere.productAttribute;
/
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