product cost is calculated per cost element, idempiere leave empty on m_costdetail, when creates m_costdetail entry.
2.0.0.v20140906-0034 official demo
Triaging from Rizwan Anwar
Still missing “Cost Element” in the cost detail tab. But what we lost if this is not recorded?
In Cost Movement Tab of this window ( Product Cost > Cost Movement) is linked to the Cost Detail record, see the attachment