Recall two familiar reasons for jarr.
After a preposition: فِي كِتَابِ زَيْدٍ - كِتَابِ is majrur because it follows فِي.
As mudaf ilayh: كِتَابُ زَيْدٍ - زَيْدٍ is majrur because it is the mudaf ilayh.
These two reasons explain jarr; they are not reasons for nasb.
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Introduction to Mansubat and the Ism of Inna
Recall two familiar reasons for jarr.
After a preposition: فِي كِتَابِ زَيْدٍ - كِتَابِ is majrur because it follows فِي.
As mudaf ilayh: كِتَابُ زَيْدٍ - زَيْدٍ is majrur because it is the mudaf ilayh.
These two reasons explain jarr; they are not reasons for nasb.