Complete Deliv and Mixed Item cat and Availability Check

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Hi Gurus,

Not sure if this is problem is new, I have searched with no clues.

A SO has 2 item categories. ZTAN, ZTAS. ZTAN is stock item, ZTAS is back to back item where a PO will be created. Same material. There is a GR processing time of 10 days.

SO created on 12.05.2014.

Item 1: MatA First Date: 15.05.2014 Item Cat: ZTAN Qty: 500 Confirmed Date = 15.05.2014 (Stock Available)

Item 2: MatA First Date: 15.05.2014 Item Cat: ZTAS Qty: 1000 Confirmed Date = 29.05.2014 (Today + 10 GR Process)

Then tick Complete Deliv. Indicator in SO overview screen.

Item 1: MatA First Date: 15.05.2014 Item Cat: ZTAN Qty: 500 Confirmed Date = 29.05.2014

Item 2: MatA First Date: 15.05.2014 Item Cat: ZTAS Qty: 1000 Confirmed Date = 29.05.2014

Save SO.

PO 1st AB line for SO item 2: Confirmed Date = 15.07.2014 results in Both SO item confirmed date = 15.07.2014

PO 2nd AB line for SO item 2: Confirmed Date = 15.06.2014 results in Both SO Item confirmed date = 15.07.2014.

You see the problem is after 2nd AB, confirmed date in SO does not change to earlier confirmed date. And even if we run the standard back order processing V_RA or V_V2, system still does not schedule earlier.

Any solution?