MIRO, reference doc., amount LC

Hello,

We create a materials document, and after that, in transaction MIRO

I put A01, R02 and put the number of the materials document, as reference.

It takes all the information from it, but ONLY the Ext. amount LC stays 0.00.

How can I make this field fill with the amount from the reference materials document?

Thanks a lot in advance

Ilian