When you can,please send invoice from piece.

When you can,please send invoice from piece.
When you can,please send invoice from piece.

When you can,please send invoice from piece.
当您方便的时候,请将发票开出.

估计是要发票以便汇款！ 请寄给我发票以便付款! 你别做外贸了

如果可以的话，请开个发票吧