Difference between Process Message Categories and Process Instructions

[#1]

Hi,

I am trying to understand the difference between Process Message Categories (o13c) and Process Instructions (o12c) and there roles.

I understand that Process Instructions are specifically linked with control recipes but my confusion is to the role of process message categories.

Spoecifically there use in PI Sheets.

Can someone give me a brief distinction/explanation please

cheers all

[Former Member]

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[Former Member]

Really need a bit more....

For example (O13C) PPPI_PROCESS_ORDER is a characteristics of Process Msg cat PI_COMM.

(O12C) PPPI_PROCESS_ORDER is a characteristics of Process Instruction catergory CONF_PH how do the two relate ?

What purpose does the Process Msg cat provide ?

I guess this is my question and confusion