Doncaster will meet Barrow in the Championship One Grand Final at Warrington next Sunday after securing a 20-0 win over Workington.
Doncaster won Sunday's final eliminator at the Keepmoat Stadium.
The south Yorkshire club overcame the absence of injured former Hull and Hull KR stand-off Paul Cooke to lead 10-0 at half-time thanks to tries from Chris Spurr and Stewart Sanderson, and they doubled their lead after the break with the aid of tries from Craig Fawcett and Nathan Powley.
Doncaster lost 22-20 at home to Barrow in their qualifying play-off, but will have their chance to get their revenge when they meet the Cumbrians at the Halliwell Jones Stadium in a curtain-raiser to the Championship Grand Final between Featherstone and Sheffield Eagles.
Update:
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