SAP Business One Fixed Assets - numbering masterdata

I set up new number groups in Administration/Setup/Fixed Assets/Numbering-masterdata to corelate to my asset class groups and have since posted assets into the module but now want to add more numbering groups, however, I am being met with warning notices "324: Number specified overlaps with an existing range" and "316: Last number in range must be larger than first"

Any ideas how to add the new numbering groups is greatly appreciated!

Edited by: Ross Early on May 16, 2011 6:31 PM