how to change the Amount in LC(DMBTR) in F-02

Usually, when we create accounting document though F-02. the Amount in LC(bseg-DMBTR) is create base on the amount(bseg-WRBTR) and the local currency .

Now I want to change this field's value, I want to know in which program create I can change the Amount in LC(bseg-dmbtr) , or can we change it in Substitution (ZRGGBS000) ?