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The Master Data dialogue _Interface_ contains technical configurations for import and export of data. It is possible to create a fixed \[company-specific\] import routine or a so-called flexible interface. Please contact AMANA for further details on these functions and their use in the GTC.  
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_Figure 13: "Interface" dialogue_

In short, the _Interface Structures_ allow you to describe the format of import files, whereas you can use _Mapping \[Positions\]_ to define the transformation of source positions to GTC form fields and to specify simple calculation logic.

{*}{_}Interface Structure_*
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_Figure 14: Interface structure_

The menu item _Interface Structure_ contains a list of all structures already defined in the GTC with their most important properties. The interface structure can be edited using the _Edit_ icon \[pencil\]. 
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_Figure 15: Create interface_

The format of the import file can be described here, that is: the file type and the fields are assigned to certain positions of the import file. 
On addition to the file-based import and export, GTC currently supports the following standard technologies:

Web services are interfaces based on the open standards, used for business-to-business communication between different systems. For example, web services can be used to retrieve and process data from GTC \[e.g. validation\] in a consolidation system.
Remote Function Calls \[RFCs\] are a proprietary SAP protocol for data exchange with SAP systems. The use of RFCs requires that a corresponding function module exists on the SAP side. In this way, balance sheet and P&L statement data can be retrieved directly from SAP and processed further, which leads to increased data security and requires less effort on the part of the GTC users.
*_NEW_*
As an alternative to the HB / StB deviation, the import of the tax balance sheet can also be defined. Since the GlobalTaxCenter only stores the difference, it must be calculated from the tax balance value and the HGB value during the import.

{*}{_}Mapping \[Positions\]_*
During the Mapping you describe how a source position is mapped to the GTC target fields. The _Export_ icon \[red arrow\] can be used to download the template for the mapping file. This is an Excel file that you can edit locally. The filled out file can be uploaded using the _Import_ button \[green arrow\]. 
The mapping supports a number of mappings to GTC positions \[possibly also with simple calculations and GTC-specific instructions\]. Please contact AMANA for more details on these functions.
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_Figure 16: Create mapping_

{*}{_}Interfaces within the tax portal_*