User is allowed to create an attribute under existing name

[GoogleCodeExporter]

The user is allowed to create an attribute under existing name. The attribute 
is renamed (e.g. from Age to Age (2) )only after the user clicks on Save 
preprocessing. This is confusing. The new name Age (2)should be already 
proposed to the user in the Preprocessing dialog and editable by the user. 
There should be also a red warning message (e.g.) "Attribute with name xxx 
already exists, choose different name".

Original issue reported on code.google.com by kli...@gmail.com on 26 Nov 2012 at 11:28

[GoogleCodeExporter]

Use local BKEF database to perform the check.

Original comment by kli...@gmail.com on 28 Nov 2012 at 5:31

[GoogleCodeExporter]

Original comment by stanislav.vojir on 6 Mar 2013 at 3:49

• Changed state: Started

[GoogleCodeExporter]

I added check for attribute name uniqueness.

Original comment by stanislav.vojir on 7 Mar 2013 at 4:20

• Changed state: Fixed