There isn't, unless you discount what Jane Tanner is actually on record as saying ... and give credence to the rather fanciful notions subscribed to on McCann hostile blogs etc with sub sections reserved for Jane Tanner et al.
In Jane's case her unforgiveable fault was to recount what she had witnessed on her brief walk between the tapas bar and the top of the street where she had an uninterrupted view of a male carrying a barefoot female child clad in pyjamas.
Unfortunately for Jane, her account wasn't supported by the accounts of Jes and Gerry. As a result her story didn't make sense to the PJ and many others. A lot of people who have never been to the town have spent many hours trying to explain why the men didn't see her, but the ones who were there didn't believe it.
pages 55 and 56
. The physical, real and effective, proximity between JANE TANNER, GERALD McCANN and JEREMY WILKINS, at the moment when the former passed them, and which coincided with the sighting of the supposed suspect, carrying a child. It results, from our understanding, as unusual that neither GERALD McCANN nor JEREMY WILKINS did not see her, nor the alleged abductor, despite the small dimensions of the space;
http://www.mccannpjfiles.co.uk/PJ/P_J_FINAL_REPORT.htm