Due to increasing reliance on suppliers, succeeding in supply chain sustainability hinges on the firm's collaborative relationship with its supply chain partners, positioning relationship conditions as a linchpin in firms' quest towards greater sustainability. This research scrutinizes if linkages between innovation, joint planning and resource sharing (i.e., JPRS or collaboration) and three dimensions of sustainability (i.e., supply chain, environmental, and social performance) are contingent on relationship conditions. Building on the force field theory and transaction cost economics, the moderation role of negative relationship conditions is examined using data collected from industries by deploying structural equation modeling (SEM) and SEM-based multi-group analysis. The relationship conditions include partner selection, power asymmetry, opportunistic behavior, and conflicting interests. Results show that the difficulty associated with partner selection played a considerable role in moderating the relationship between perceived interdependency and both collaboration and innovation. The influence of opportunistic behavior and conflicting interests to serve as a moderator in the relationships from innovation and collaboration to the three sustainability dimensions was tenuous, whereas the power asymmetry failed to serve as an influential moderator. This paper contributes to the planning and controlling supply chain sustainability literature by outlining paths to sustainability, considering negative relationship conditions within an emerging economy context, and offering pathways for economies of similar development to undertake these efforts.