set expression

[upaliwije]

Please help me to write the following set expression in not equal form. That is To_month not equal to R_month

sum( {1<[To_MONTH]={"$(=Only([R_MONTH]))"}>} [PREMIUM] )

[Sokkorn · Accepted solution]

sum( {1<[To_MONTH] -= {"$(=Only([R_MONTH]))"}>} [PREMIUM] )