this post might be related to this one:
But there is
- no suitable answer for me
- It is not allowed to ask another time in the other post I guess so I created a new one.
I have got a Shapefile with all boroughs in France (projection = EPSG:2154 - RGF93 / Lambert-93) I like to add some columns: area, Population, average income. The answer to make the columns bigger for area calculation does not work because the maximum size seems to be 10 in my Qgis version (1.8 Lisboa). If I like to add simply numbers (population number for example that does not work either. It does not matter if I use "interger" "real" or "string"...while saving it tells me that saving did not work because it was not able to delete attributes. OGR-failure while deleting field 13. Invalid field index
Afterwards the result seems to be different: sometimes it can save the result, sometimes there will be set "NULL". It can not be so difficult to add a column in a shapefile can it?
To show you what I am working with 2 screenshots (I added the last 2 columns):