وَحُكْمُهُ: أَنْ لَا تَدْخُلَهُ الْكَسْرَةُ وَالتَّنْوِينُ، وَيَكُونَ فِي مَوْضِعِ الْجَرِّ مَفْتُوحًا أَبَدًا.
Translation: Its rule is not to take kasra or tanwīn; instead it takes fatḥa in the genitive position.
In its ordinary form, a diptote takes ḍamma in the nominative, fatḥa in the accusative, and fatḥa in the genitive, without tanwīn.
This is the general rule; a diptote made definite with al- or used as muḍāf can take kasra in the genitive.
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Munṣarif and Ghayr Munṣarif — Definitions, Causes and Parsing
وَحُكْمُهُ: أَنْ لَا تَدْخُلَهُ الْكَسْرَةُ وَالتَّنْوِينُ، وَيَكُونَ فِي مَوْضِعِ الْجَرِّ مَفْتُوحًا أَبَدًا.
Translation: Its rule is not to take kasra or tanwīn; instead it takes fatḥa in the genitive position.
In its ordinary form, a diptote takes ḍamma in the nominative, fatḥa in the accusative, and fatḥa in the genitive, without tanwīn.
This is the general rule; a diptote made definite with al- or used as muḍāf can take kasra in the genitive.