Project Number Applies to BU

Dears,

Per Doc. 625475.1 the project number to BU will be the 1st priority if the DAMMI BU is left blank.

Here is the scenario: SO header BP 10 - Company A, project number 100 to BU 10

Detail 3 lines:

BP 11 - Company A, project number 100 to BU 11

BP 20 - Company B, project number 200 to BU 20

BP 30 - Company C, project number 300 to BU 30

After R42800 runs what BU will be used to DMAAI 4230, 4220, and 4240?

I am assuming DMAAI 4230 and 4220 are from project number of F4211.EMCU which are defaulted in from F4201.MCU and so will be all 100? Can I manually change the F4211.EMCU before R42800 runs to get project number 100, 200, and 300 respectively?