我十天前寄出的I140(Eb1a),目前还没有收到任何收据。计划再申请另一个I140(NIW)，请问是现在寄出申请材料好还是等收到前一个申请的case number？
因为I140 part4, question 6：
6. Has any immigrant visa petition ever been filed by or on behalf of this person?
No Yes-attach an explanation.
If you answered yes to any of these questions, please provide the case number, office location, date of decision and disposition of the decision on aseparate sheet(s) of paper
从问题上看似乎我必须收到第一个的case number 才能递出第二个申请，请问对吗？ 谢谢！