We need to define between rules for item numbers and categories using AMX (BPM) but requisition line

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For purchasing requisition approval, We need to define between rules for item numbers and categories using AMX (BPM) but requisition line dimensions are all empty. Any experience and guidance here?

What should we do to fill the req dimensions to be used in BPM?

any example on how to define a item number and category rule in BPM using between operator

Many thanks