Different scenarios depending of the tax registration number

Hello everyone.

We are using suitetax, the subsidiary is located in Spain, and I want to be clear of what happens depending of the tax registration number, all customers and vendors located in Europe.

For sales orders:

Contry/Nexus/Tax registration number

European Yes/Yes/Yes Intra-community sale (B2B sale)

European Yes/Yes/No OSS Standard (B2C sale)

Spanish Yes/Yes/Yes ?

Spanish Yes/Yes/No ?

For purchase orders:

European Yes/Yes/Yes Intra-community purchase

European Yes/Yes/No ?

Spanish Yes/Yes/Yes Domestic purchase

Spanish Yes/Yes/No ?

Could you please help me to complete this information.