N,N-dimethylethanolamine phosphate + S-adenosyl-L-homocysteine + H(+) => N-methylethanolamine phosphate + S-adenosyl-L-methionine
n,n-dimethylethanolamine phosphate + s-adenosyl-l-homocysteine + h(+) => n-methylethanolamine phosphate + s-adenosyl-l-methionine