As macuser-22 said, a nonreportable trustee-to-trustee transfer cannot be used to move money from a traditional IRA to a Roth IRA because the tax code defines a Roth conversion as a distribution from the traditional IRA and a taxable rollover to the Roth IRA. You should first contact the traditional IRA custodian to obtain a 2018 Form 1099-R to correctly report the distribution from the traditional IRA. In the event that they will not produce the form, claiming that they properly initiated a transfer to another traditional IRA, you'll need to submit a substitute Form 1099-R (Form 4852) for the traditional IRA distribution. This Form 1099-R will have the distribution amount in boxes 1 and 2a, box 2b Taxable amount not determined marked, code 1 or 7 in box 7 depending on your age, and the IRA/SEP/SIMPLE box marked. You'll need to include explanation.
