SRM Vendor Number Range

Hi experts,

currently implementing srm7 ehp3 and shown below is the set up for BP groupings and number range.

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question is, I have ecc Vendor with code IC1410 which I like to replicate to SRM, but obviously whose number does not fall inside the external number range set (131-1999999).

any possible workaround on this?

on my end, i'm thinking to change the number range on this and include alphanumeric, How to do this in this case?

thanks for your inputs.