Budget Encumbrance control for Asset purchase

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We are not able to control the asset purchase by using Encumbrance control, since asset cost account will not come in to Procure to pay process, this is being challenge for us. Can anyone advice the solution or workaround to control the asset cost account during the PR, PO and AP invoice level.

We need absolute control for all asset purchase, how can we enable the control. If i enable in supplementary rule it will not be available in procurement flow like PR, PO and AP Inv. since all cost code will hit during post mas addition proces.

Thanks