how to get ItemUid for userdefined field

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Hi all,

i am working on production order in that form i created one user defined field ie Vendorname(udf) for this i wanted to do validation but i am not able to do validation for that field.For other fields ie for predefined one i am able to do validation getting Item uid but for User defined field i am not able to do this giving Item uid. Can any one help me regarding this issue asap.