The answer to the cancellation is only guesswork but one simple...

The answer to the cancellation is only guesswork but one simple possibility is chemistry,
It's not always cloak and dagger.
With the elute being acid, UEC may be concerned that this will then make their resin less usable for an alkaline elute.

Anyway,in the long run Asculpeous agrees with several posters that to have their own resin plant gives more control and probably better recoveries as the process can be tweeked more than probably what a third party would be prepared to do,

As said,just guessing,