Two propositions may be litigated separately:
First: Zayd owed Khalid 1,000 dirhams.
Second: Zayd later paid those 1,000 dirhams.
Qad qadaytukaha acknowledges the first but asserts the second. Repayment may still require proof or the creditor's admission. Similarly ajjilni biha acknowledges the debt but does not itself establish a mutually accepted extension.
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Admission and alleged repayment are distinct
Kitab al-Iqrar: Debt and Trust, Admissions by Reply, and Deferred Debts
Two propositions may be litigated separately:
First: Zayd owed Khalid 1,000 dirhams.
Second: Zayd later paid those 1,000 dirhams.
Qad qadaytukaha acknowledges the first but asserts the second. Repayment may still require proof or the creditor's admission. Similarly ajjilni biha acknowledges the debt but does not itself establish a mutually accepted extension.