If such stage was completed based on un-signed English financial statements (USEFS), the doer is to initial all pages of the USEFS.
Is the above sentence grammatically correct with two different tenses? I have argued with my friend that the above sentence was wrong as the tenses used were different; "The if tense is in the past while the second part is in the present" and the sentence in this form would be awkward for English native speakers.
Thanks!

