Using ASHRAE Addenda

Hi everybody; The reference guide states "Project teams wishing to use ASHRAE approved addenda for the purposes of this credit may do so at their discretion. Addenda must be applied consistently across all LEED credits." Regarding this, I've been wanting to know if our project team can use only one addendum of the many addenda published by ASHRAE (and ignore the rest of them), or if a project chooses to use addenda it has to comply with every addenda published? I've been looking for an answer for some time and the only information i've found is this USGBC memorandum from 2007. http://www.usgbc.org/ShowFile.aspx?DocumentID=2664 Its language make it seem as if one could use any addendum one wishes to use, ignoring the others, but I would like to be sure about this. Any idea? Thanks for your help!