The reason is very simple

来源: 于 2006-01-23 16:50:21 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

If you give USCIS an entry date and an I-94 #,they should be matchable,if you give previous I-94 # them,
if the immigration officer check it on computer system of Homeland Security Dept. he/she won't find your record to enter USA,it may delay your case processing.