You have attempted an invalid sublist or line item operation. You are either trying to access a field on a non-existent line or you are trying to add or remove lines from a static sublist

Integrator.io
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Rhys,

It looks like you're working with our Support team on this, which is great since they can look into your error. I'll also follow that ticket and check with some others internally to share any additional insights here.

In the meantime, you could check out this post which has the same error.

Thanks!