Thanks Sravanthi,
As you have mentioned, reason behind the issue was conflict between Spain SII and UK MTD ER configurations.
Actually I had communication with MS, and technician has helped me to makes following changes which solved an error.
1. We didn't add any derived configuration
2. "Default for model mapping" should be activated for "ES SII import model mapping" & "SII model mapping" and should be deactivated for "SII Import Format (ES)"
3. "Default for model mapping" should be activated for "MTD VAT importing model mapping (UK)" and should be deactivated for "MTD VAT model mapping"
4. For Spain LE, Under Tax/Setup/Electronic messages/Message processing actions - for ImportResponse we chose Model mapping = "ES SII importing model mapping"
After these steps for Spain, responses were imported without an error. And processes for UK worked fine for our customer.