BA to Iberia FF transition (whilst keeping my current BA Silver benefits)

[Robertspj0]

Hi, Whilst I can change a BA booking FF number (from BA to Iberia) on the RAM site (just before boarding), the RAM site does not recognise when I enter a booking made direct with AA (it’s a US domestic flight that I could only book at AA.com rather than BA.com). Does anyone know another way to do this? If not, it feels like that is an issue in keeping Silver benefits up to boarding but then crediting flights to Iberia FF scheme. Thanks