Section 109(1) in The Gujarat Municipalities Act, 1963
(1)The executive committee may at any time alter the assessment-list by inserting or altering an entry in respect of any property, such entry having been omitted from or erroneously made in the assessment-list through fraud, accident or mistake or in respect of any building constructed, altered, added to or reconstructed in whole or in part where such construction, alteration, addition or reconstruction has been completed after the preparation of the assessment list after giving notice to any person interested in the alteration of the list of a date not less than one month from the date of service of such notice, before which any objection to the alteration should be made.