No problem. The issue is dealt with more clearly in CTRs and I'm suggesting there is no logical reason to deal with it differently on a SAR. Please call the Helpline to review if you are uncertain:
From the CTR instructions:
Item *4 Individual's last name or entity's legal name: Enter the individual's last name or the entity's legal name. The entity legal name is the name on the articles of incorporation or other document that established the entity. If an entity is being recorded in Part I, check box 4 “If entity.” Do not check box 4 “If entity” if the person involved in the transaction is a sole proprietorship.
From the FinCEN CTR Webinar:
Q: How do I complete a FinCEN CTR when the person on whose behalf the transaction is conducted is a sole proprietorship?
Customer A withdraws $15,000 in cash from an account that belongs to Customer A’s sole proprietorship.
The financial institution would file a CTR and complete a Part I on Customer A by selecting Item 2a (Person conducting transaction on own behalf). The last and first name of the sole proprietor would be entered in Items 4 and 5, respectively, and include the sole proprietorship’s DBA name in Item 8 “Alternate Name Field” if applicable. Only one Part I would need to be filled out in this scenario as Customer A is a sole proprietorship and consistent with the definition of “person” in the Bank Secrecy Act’s implementing regulations, a sole proprietorship is not a separate legal person from its individual owner. Thus, the financial institution is required to complete the remainder of Part I, by entering the owner’s social security number (“SSN”), home address, date of birth, and occupation. Only one Part I is required, even if the business operations have a different address and/or tax identification number (“TIN”) than its owner.
It took FinCEN a couple years to figure out that a sole proprietorship was not a "person," but they've got it down now.
In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.