[CFA入门] 请教一道notes上关于ethics的题～各位大大 offering, 的, purchase, receives, Because

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Because of minimum lot size restriction, a portfolio manager allocates the bonds she receives from an oversubscribed bond offering to her clients in a way that is not strictly proportional to their purchase requests.
为什么这个没有violation of Fair Dealing?
minimum lot size restriction 是什么意思～
求解答～～