In FM you can impose your control on either on a FM posting address or on AVC control object level. Generally, the first one is more suitable when you control the consumption as such and the second one would be useful, if you want to keep FM posting address untouched (for reporting reasons). Of course, the first utility will leave you with more transparent and clear model. So, for example, should you want to release the budget (decrease consumption) during the assessment, you simply don't touch FM posting address both for credit and debit sides of your operations. But, suppose, you want FC B and C to absorb consumption (consume the budget), but FC A consumption should remain untouched. For this, you would need to derive another, dummy statistical, FM address (commitment item, most likely) for the credit part of your assessment. FMDERIVE function allows usage of various parameters, potentially all COBL structure, while setting a rule.
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