Every profession has its own ethics or code of professional practice which guide the work behaviours. It cuts across organizational boundaries. Project Management Institute (PMI®) calls this Professional Responsibility.
Key ethics, among others, include:
§ Be honest: there is difference between diplomacy and misrepresentation.
§ Do not take bribe: expression of gratitude is not illegal, but does not have to be fulfilled.
§ Gifts: know and follow your organization guidelines for gifts received from third parties and partners.
§ Respect contract/agreements’ terms and conditions.
§ Negotiate in good faith. Otherwise a party who felt cheated may have a hidden resentment or vengeance attitude, which could materialise in future dealings.