Fannie Mae-No Politics (FNMA)

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This is not full true just part of it.
Please see below from Fidelity Trading Restrictions-you can have up to 3 these violations through one Year
If you accumulate three good faith violations during any 12-month period in your cash account you will be restricted to purchasing securities in that account, and every account with similar ownership, with settled cash only for the next 90 days.:

What are possible cash account violations?

If a security purchased in your cash account is sold prior to being paid for with settled funds in the account, a good faith violation has occurred. The reason it is referred to as a good faith violation is that trade activity is giving the appearance that sales proceeds are being used to cover buy orders when there is insufficient settled cash to cover these purchases. Basically, trade activity indicates that a good faith effort to deposit additional cash into the account will not happen.

Good faith violation example 1:
Cash available to trade = $0.00

On Monday morning, a customer sells XYZ stock netting $10,000 in cash account proceeds.
On Monday afternoon, the customer buys ABC stock for $10,000.
If the ABC stock is sold prior to Thursday (settlement date of the XYZ sale), a good faith violation would be charged as the ABC stock is not considered fully paid for prior to sale.