Claus,
Mr.Jain is correct. If you assign a Calculation indicator - which contains a different exchange rate type other than 'M' - in the step 'Define Company Code Additional Data' to your company code, this exchange rate type will be used in TBB1 posting. In additional to assigning the correct calculation indicator in this step, you have to check the radio button 'Use Rate type in Financial Transaction' appearing in the same place. This will impact only Transaction Manager postings. This will not affect your FI postings or any other module postings.
If you do not select this, your assignment to the company code will not have any impact.
Read the documentation for the radio button 'Use Rate type in Financial Transaction' which is reproduced below.
Hope this helps.
Kalyan
Use of Exchange Rate Type in Financial Transactions
- When you set this indicator, the exchange rate type applied in all financial transactions of the Transaction Manager to convert amounts into the local currency is the exchange rate type that you specify in Customizing for the Transaction Manager under General Settings -> Organization -> Define Company Code Additional Data in the area Exchange Rate Settings.
- If you do not set this indicator, conversions within financial transactions use exchange rate type M.
Dependencies
Note, however, that these settings can be overwritten by other valuation area-dependent settings. For more information, see under General Settings -> Accounting -> Organization -> Assign Accounting Codes and Valuation Areas.
Furthermore, there are exchange rate type settings for special functions, such as key date valuation. For more information, see under General Settings -> Accounting -> Settings for Position Management -> Key Date Valuation.