3304995 - Error when converting a string field using ToNumber() function in Story report

User is trying to convert a string field to number in query designer using ToNumber() function but gets "Internal error occurred while processing" error message when trying to preview the query. 

User is trying to convert a calculated dimension but receives the error message: "Formula could not be computed: Choose a property for dimension xxxx in function "ToNumber". Please complete or rewrite the formula."

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