I doubt the business policy is that you can't take partners out for meals and/or invest in relationship building via meals and entertainment expenditures. Nor is the policy likely that you cannot participate in such activities when offered by the partner.

The key is that you should not exchange company resources for what may be perceived as or actually be personal benefit. Outside a contractual term, set up a quarterly dinner to strategize, synchronize, assess, etc where the vendor pays? Sure! But, explicitly concede a material business term in a contract in direct exchange for a term that personally enriches you? No!