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Allocation Into Periods 
Using the parameter Classify by Periods, the program allocates tax items into individual periods.

Amendments of the VAT Act applicable since 1 April 1999 are not fully unambiguous. Opinions of individual tax consultants on allocating into separate periods are varying. In the effort to provide for options to use another method of allocating into periods than performed until now, there were programmed that are not necessary to be used.
The allocation criterion is the key date, which can be either the posting date or the document date (according to what you specify in the Dates group box). The key date is filled with the latest date from the invoice and documents of the appropriate payments being sufficient to cover the VAT amount.
When using the parameter Date of Tax Return Has Influence is considered, the allocating algorithm into the periods is as follows:
By default, the key date parameter is set to Document Date (the aforementioned implies that this feature can be used only in case the date of taxable performance is filled in the date of document with invoices, the real date of payment according to the bank statement into the date of the document with payments, that is, the key date parameter, is set as a default as the date of the document when the program is started over).
If the document date of the invoice document as well as the document dates of payment documents fall in an appropriate period and in addition the date of the invoice posting is equal to or less than the date of completing the tax return, the tax will be transfer-posted within the appropriate period of time. If the date of invoice posting is later than that of completing the tax return, the tax shall be transfer-posted in a later period (in which it again depends on the position of the date of posting relative to the dates of tax return in later periods). Attention should be paid, when using this feature, the Customizing activity Enter Report Date for Deferred Tax should be filled in, particularly for all the periods processed also back to the past. In an opposite case, the error codes No. 713 or 714 will be returned.
