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231:
232: IF (((old_references.unit_difficulty = new_references.unit_difficulty)) OR
233: ((new_references.unit_difficulty IS NULL))) THEN
234: NULL;
235: ELSIF NOT Igs_Ad_Code_Classes_Pkg.Get_uk2_For_Validation (
236: new_references.unit_difficulty ,
237: 'UNIT_DIFFICULTY',
238: 'N'
239: ) THEN