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DX uses PowerCenter. To support the 997, it would require the EDI library to be added. The MFT license restriction is such that it requires PC.
To Further add to Dan Rezac's helpful comment: DX support EDI via the EDI accelerator from informatica, which is a package that combined DX and Power center artifacts (workflows, DT code etc.). Thus, Powercenter is a must for any EDI processing.