This is most likely because your 1:N relationship is set to be 'Parental' in which case this behaviour is always used. You'll need to set the relationship to Configurable Cascading - you'll then be able to change these settings.
hth
This is most likely because your 1:N relationship is set to be 'Parental' in which case this behaviour is always used. You'll need to set the relationship to Configurable Cascading - you'll then be able to change these settings.
hth