codeine-guaifenesin 10 mg–100 mg/5 mL syrup - anyone with Multum know what NDC will work for e-prescribing?

We are on Multum and I cannot figure out what NDC will work for e-prescribing codeine-guaifenesin 10 mg – 100 mg / 5 mL syrup.
The default NDC is 58657-500-04 with no other option. I’ve manually entered a few alternatives but they also fail.
I have opened a case with eCW support: Case# 10372587