(a) Federal credit unions with assets of $10,000,000 or greater must comply with all generally accepted accounting principles applicable to reports or statements required to be filed with NCUA. Federal credit unions with assets less than $10,000,000 are encouraged to do the same, but are not required to do so.

(b) A Federal credit union must maintain documentation for each investment transaction for as long as it holds the investment and until the documentation has been audited in accordance with § 715.4 of this chapter and examined by NCUA. The documentation should include, where applicable, bids and prices at purchase and sale and for periodic updates, relevant disclosure documents or a description of the security from an industry-recognized information provider, financial data, and tests and reports required by the Federal credit union's investment policy and this part.

(c) A Federal credit union must maintain documentation its board of directors used to approve a broker-dealer or a safekeeper for as long as the broker-dealer or safekeeper is approved and until the documentation has been audited in accordance with § 715.4 of this chapter and examined by NCUA.

(d) A Federal credit union must obtain an individual confirmation statement from each broker-dealer for each investment purchased or sold.