The procedure for revision of cadastral value due to changes in the data of the Unified State Register of Real Estate (Article 16 of the Law on Cadastral Valuation) provides, among other things, clarification of cadastral value, which is calculated on the basis of incomplete or unreliable data on the object. In this role, this procedure competes with the procedure for correction of errors made in determining the cadastral value (Art. 21 of the Law on cadastral valuation). The author concludes that free competition of the described procedures is possible, but only in those cases when the revision of the cadastral value associated with the correction of the error leads to a decrease in the cadastral value. If the revision leads to an increase in the cadastral value and is related to the correction of an error, then only a special procedure under Article 21 of the Law on Cadastral Valuation can be applied.