When I adjust the basis on Form 8949 to account for an adjustment to basis on Schedule K-1, should I indicate adjustment code B in column f of Form 8949 and show the adjustment amount in column g? Or should I adjust the basis in column e directly? I'm thinking the former makes sense as doing the latter would make an apparent discrepancy with 1099-B.

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When I adjust the basis on Form 8949 to account for an adjustment to basis on Schedule K-1, should I indicate adjustment code B in column f of Form 8949 and show the adjustment amount in column g? “================You ‘d receive a Form 1099-B or substitute statement, the basis shown in box 3 is incorrect, then you need to enter code B in column b; you also need to enter the basis shown on Form 1099-B or substitute statement in column (f).If the correct basis is higher than the basis shown on Form 1099-B or substitute statement, you should enter the difference between the two amounts as a negative number in parentheses in column (g).If the correct basis is lower than the basis shown on Form 1099-B or substitute statement, enter the difference between the two amounts as a positive number in column (g).

Thanks Wnhough, very thorough answer!