BYD_HF: dump posting tax returns containing clearing w/o tax

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Symptom
The system dumps when you try to declare a tax return.
Other terms
tax declaration, clearing, deferred tax, product tax declaration
Reason and Prerequisites
The dump occurs when the tax return contains payments of invoices with deferred taxes of 0%.
Solution
The solution is provided as hotfix 21045.

Extension of correction report

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Symptom
Correction Report FOP_CHECK_DUECLR_DATE, which repairs the clearing date of clearings, does not provide the information if a clearing has activated deferred tax.
Other terms
Deferred tax, clearing date
Reason and Prerequisites
In order to figure out which clearings with a wrong clearing date have activated deferred tax, the deferred tax amount needs to be displayed for each [...]