Errors/Chain errors
BasketConcentrationCapExceeded
A chain-side capacity limit was hit; reduce the size or count of the request
The swap_basket buy would leave the destination holding above the BasketConcentrationCap share of fund NAV (holdings marked at realizable value; the cap is u16-normalized, so 4096 means 1/16). Buy less, or spread the fund across more holdings — at the 1/16 cap a traded fund needs at least 16. Query BasketConcentrationCap for the live cap. Not enforced while the chain has fewer subnets than the cap demands.
Declared by the SubtensorModule pallet; it classifies to the semantic code limit_exceeded.
Declared at pallets/subtensor/src/macros/errors.rs#L372.
Remediation
A chain-side capacity limit was hit; reduce the size or count of the request
The same explanation is available in the terminal: btcli explain BasketConcentrationCapExceeded.