Saving an Lookup Table with a large series of values results in ”The Security Validation for this page has timed out” error

Scenario: Attempting to save a large look up table value set in MS EPM 2010.

Cause: The time taken to popluate the large value set exceeds the time available to update the lookup table resulting in a time out error when a save is attempted on the the lookup tables data set.

Error: Timed Out error as per below snapshot:

RBSLookUpTimedOUt

Workaround: To overcome this issue save the look up table in more frequent and shorter intervals after making just a few updates rather than attempting to save all changes at once at the end.Failure to do this will result in the Timed out error and you will lose the data.:(

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