Every license has a certain transaction limit for the tax report to be generated.
Please note, that the transaction limit refers only to the transactions in the respective tax year! (not the total across all years, as other tax software providers do)
Each transaction row counts for one transaction (e.g. Trade, Transfer, Airdrop, Staking).
You can always import unlimited transactions in terms of Portfolio & Performance Tracking, but for generating a tax report the displayed transaction limits apply.