Some travel management company sources are concerned about competition from SAP Concur's Hipmunk-powered small-business offering. A new TripLink-related requirement for Concur's preferred partners is irksome to others. It's just another day in the alliance, ever uneasy for some, between Concur and TMCs.

Whether they're resellers or preferred partners, certain TMCs have worried about the tech company's moves in travel since its acquisitions years ago of self-booking, mid-office and data reporting automation.

Commenting on the condition of anonymity to preserve their relationships . . .

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