Thank you for the confirmation. I ended up going a different, simpler route, by calling this method (BRApi.Utilities.ExecuteDataMgmtSequence) which executes an out-of-the-box DM sequence I found within RCM. I should have went the simple route out of the gate, but learned a few good things within this post, so thank you guys!
for future reference,
"I was thinking that line 29 (Workspace.OFC.RCM.Legacy.SolutionHelper) would replace line 17 (OneStream.BusinessRule.DashboardExtender.RCM_SolutionHelper), for example. Any guidance on how to solve this issue I am running into?"
Those two lines refer to different parts of the solution You might need them both.
Workspace.OFC.RCM.Legacy.SolutionHelper- Refers to the classes in the RCM Assembly of the Reconciliation Manager maintenance Unit, in the Legacy/SolutionHelper folder.
OneStream.BusinessRule.DashboardExtender.RCM_SolutionHelper - Refers to the RCM_SolutionHelper business rule which features an 11,000 line Main Class and a few smaller classes at the bottom.
