Marrying Spanish - I am from EU

Hi,

I hope you could help me. I am from the Czech Republic and want to marry my spanish boyfriend there under local authority. We live in Czech and do not plan to live in Spain. However, in order to get a confirmation that there are no legal obstructions preventing him from marriage (basically a confirmation that he is single) we are required to do a test whether this is not a convenience marriage and bring two witnesses confirming that we know each other. I also have to submit a loads of papers about me. As we are both from the EU I feel that this is unnecessary step and wanted to ask whether there is any EU legislation regulating this area?

Thanks a lot in advance.

Daniela