Effect of non-registration bars partners or firms from suing unless registered and shown in the Register of Firms. Non-registration bars partners or firms from instituting suits to enforce contractual rights in court unless the firm is registered and the suing persons are shown in the Register of Firms; this bar covers set-off claims but excludes suits for dissolution or accounts, realisation of dissolved firm property, powers of official assignees or receivers under insolvency law, territorial exclusions, and specified small-value small-cause-court claims and related execution proceedings.