Hi, all.
I found be displayed ID Number at Excel that download from Info Window.

Example reproduce

1: Open Invoice Info
2: click on Export button
3: open the Excel.
4: Business Partner and Currency columns is displayed ID Number.

I investigated the cause.
The cause relate IDEMPIERE-3973.( https://idempiere.atlassian.net/browse/IDEMPIERE-3973 )
getValue() method of XlsExporter class that is Inner Class of InfoWindow was updated.

There is comment out Logic.
I think It may better be uncomment out with a little improvement.
ref:https://groups.google.com/forum/?fromgroups#!topic/idempiere/Am8uU_Lr56Y