obsolete S-adenosyl-L-methionine:N,N-dimethyl-beta-alanine N-methyltransferase activity (obsolete GO:0102709)
OBSOLETE. Catalysis of the reaction: N,N-dimethyl-beta-alanine + S-adenosyl-L-methionine = H+ + beta-alanine betaine + S-adenosyl-L-homocysteine.