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Convert currency value from internal(SAP) to external(display)
Values stored in fields of type CURR can have different values than those displayed on screen. To ensure the correct value is displayed on screen or used in calculations the value in the field must be accosiated to its currency unit. This can be done using a number of standard ABAP statements like WRITE/ *Write TO and also with the FM CURRENCY_AMOUNT_SAP_TO_DISPLAY. Once you have done this you may want to convert the value to another currency.
* Convert Internal SAP value to Currency value
data: p_intval like wmto_s-amount. "Internal Amount
data: gd_disval like wmto_s-amount. "Display Amount
call function 'CURRENCY_AMOUNT_SAP_TO_DISPLAY'
exporting
currency = po_tab-waers
amount_internal = p_intval
importing
amount_display = gd_disval
exceptions
internal_error = 1
others = 2.