udm_specialist - Partial Payment (Not residual)

Hi All,

I have posted an invoice of $1000 (FB70) and posted partial payment (F-28) $400 for that invoice. I can see both line items as open items in FBL5N. Here my question is why the partial payment is not reflecting in Amount Paid column in Udm_specialist t.code.

Please give inputs on this.

Regards,

Raghu