I changed it, sorry for taking so long. ( see changeset :56718057)

@Harald Hartmann advised changing the "nommer" key to "ref". Thanks for the guidance sorry for taking so long to do it.

Hello Harald, yes the buildings are owned by a Holiday resort and as part of a work project, we had to digitise them. The tag "nommer" is the designation given to each building by the company. Would you suggest another taggin method? We would like to show them the value of adding the data to openstreetmap.

Please revert as this is untrue change