如何使用OM中default rule根據subinventory設定tax code

CREATE OR REPLACE PACKAGE BODY DEF_TAX_PKG
AS
   FUNCTION DEF_TAX_FCN (
      p_database_object_name   IN   VARCHAR2,
      p_attribute_code         IN   VARCHAR2
   )
      RETURN VARCHAR2
   AS
      l_org_id                 NUMBER;
      l_subinventory           VARCHAR2 (100);
      l_tax_code               VARCHAR2 (100);
      l_debug_level   CONSTANT NUMBER         := oe_debug_pub.g_debug_level;
   BEGIN
      IF     ont_line_def_hdlr.g_record.org_id IS NOT NULL
         AND ont_line_def_hdlr.g_record.subinventory IS NOT NULL
      THEN
         l_org_id := ont_line_def_hdlr.g_record.org_id;
         l_subinventory := ont_line_def_hdlr.g_record.subinventory;
 
         IF     l_org_id = 288
            AND (   l_subinventory = 'RTSGMINFG'
                 OR (    l_subinventory LIKE 'JDSG%'
                     AND (    l_subinventory NOT LIKE 'JDSG%SIN'
                          AND l_subinventory NOT LIKE 'JDSGCPBSTG'
                         )
                    )
                )
         THEN
            l_tax_code := '0';
         ELSE
            l_tax_code := NULL;
         END IF;
      END IF;
 
      RETURN l_tax_code;
   EXCEPTION
      WHEN OTHERS
      THEN
         IF l_debug_level > 0
         THEN
            oe_debug_pub.ADD ('Error in DEF_TAX_FNC');
            oe_debug_pub.ADD ('Error :' || SUBSTR (SQLERRM, 1, 200));
         END IF;
 
         RETURN NULL;
   END DEF_TAX_FCN;
END;

    IF p_entity_code = OE_GLOBALS.G_ENTITY_LINE THEN
           x_extn_dep_tbl(l_index).source_attribute := OE_LINE_UTIL.G_SUBINVENTORY;
           x_extn_dep_tbl(l_index).dependent_attribute := OE_LINE_UTIL.G_TAX;
           x_extn_dep_tbl(l_index).enabled_flag := 'Y';
           l_index := l_index+1;
    END IF;