Field help (SQHNUM) 

The quote number allows the quote to be identified in a unique way. This number is automatically assigned or entered upon each creation of a quote following the counter parameterization defined for the quotes.

If the quote counter is defined with automatic allocation, the quote number field is not accessible and the counter is assigned to the quote creation. Conversely, if the quote counter is defined with manual allocation, it is possible to enter it manually. If it is not entered at the moment of creation, the system will automatically assign a quote number according to the counter.