Upon receipt of an application it shall be the duty of the department to make an endorsement thereon of the date of its receipt, and to keep a record of same. If upon examination, the application is found to be defective, it shall be returned to the applicant for correction or completion, and the date and the reasons for the return thereof shall be endorsed thereon and made a record in his or her office. No application shall lose its priority of filing on account of such defects, provided acceptable maps, drawings, and such data as is required by the department shall be filed with the department within such reasonable time as it shall require.