What does “not yet attained at the time of request” mean in ṭalabī inshāʾ?

Inshāʾ: Requestive and Non-requestive Forms, Imperative Constructions and Rhetorical Functions

• The requested thing must be eternally impossible
• The requested realization has not yet taken place at the time of request
• Every request is directed to the past
• The requested object must be grammatically indefinite