Metastorm 9.0 to 9.1 – Same key has been added


So I performed the relatively simple Metastorm 9.0 to 9.1 upgrade this week and for the most part, functionality for existing applications has remained.  There are however a few issues I experienced, the biggest being a new message appearing on a few of my forms. ‘An item with the same key has already been added’.

The error kept showing its face on grid heavy forms, especially when you select a row in a grid or where there are buttons on a form and the grids are dependant on other fields.  After some trial and error (and guess-work) it became apparent which grid was causing the error to occur and further to that I noticed that the grid had the same business object item assigned to 2 columns.  I killed one of these columns, redeployed and all was well. The annoying part is that this worked in v9.0 with no issues.  So it seems that in 9.1 you can only assign business object items to a single grid column only.

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