We're a company working in building industry and have a program, develeoped together with our software vendor, to create quotes and configurate products. The program uses a MS SQL database.
It stores mainly following data (customer created): quotes, created material, prices (extra charge), users with names, company phone numbers, emails, etc., customers (customers of our customer), text modules (cover notes, terms, etc.).
When we release a new version (update) sometimes issues occur which happen only at our customers because they've a different database structure for example or different data.
Therefore my question: is it legal to ask a customer if we can use their database for testing purpose or is it not?