37 C.F.R. § 1.496
Examination of international applications in the national stage
National stage applications having paid therein the search fee as set forth in § 1.492(b)(1) and examination fee as set forth in § 1.492(c)(1) may be amended subsequent to the date of commencement of national stage processing only to the extent necessary to eliminate objections as to form or to cancel rejected claims. Such national stage applications will be advanced out of turn for examination.