Filtering on multi-value parameter

[thejav]

I have a parameter with multiple values separated by commas (e.g. AF,AJ), i need to create a filter on a query that insures the values in a data item is in the list of values contained in the parameter.

For example, the parameter contains: AF,AJ, if the value that is in the data item (a column in a table) is AF or AJ then it should be included. If the value is anything else (e.g AFF or BF etc) then it should not be included.

How can i do this?