obsolete S-adenosyl-L-methionine:N-methyl-beta-alanine N-methyltransferase activity (obsolete GO:0102708)
OBSOLETE. Catalysis of the reaction: N-methyl-beta-alanine + S-adenosyl-L-methionine = H+ + N,N-dimethyl-beta-alanine + S-adenosyl-L-homocysteine.