<ReferencingAttributeRequiredRule> (RibbonDiffXml)

Статья
07/22/2016

Applies To: Dynamics CRM 2015

A rule that detects whether the referencing attribute for an entity is required.

Syntax

<ReferencingAttributeRequiredRule 
 Default=["0" | "1" | "true" | "false"]
 InvertResult=["0" | "1" | "true" | "false"]
 />

Attributes and Elements

The following describes the attributes, child elements, and parent elements.

Attributes

Attribute	Description	Type	Usage
Default	Sets the default return value for the rule if the actual value cannot be determined.	Boolean	Optional
InvertResult	Negates the return value of the rule.	Boolean	Optional

Child Elements

This element has no child elements.

Parent Elements

Element	Description
<DisplayRule> (RibbonDiffXml)	Specifies either the definition of a rule used to display a ribbon element or a reference to a DisplayRule from a command definition.
<Or> (RibbonDiffXml)	Specifies a set of rules that must be evaluated together.

Remarks

This is a very specific rule for a very specific case. Use this rule when there is a relationship bound subgrid or an associated grid on the page. This rule will test whether the referencing attribute used in the relationship is required. This rule is used to hide the Add Existing <record type> button when it isn’t appropriate to display it.

In an entity relationship the lookup field in the related record (the referencing attribute) may be required or not. For example, the Regarding field of an activity is not required yet the Potential Customer field of an opportunity is required. The Add Existing Activity button will set the Regarding field value to the current record context and it can only work if the Regarding field doesn’t already have a value. All Opportunity records have a value in their Potential Customer field, so it never makes sense to display an Add Existing Opportunity button. This rule detects that the referencing attribute is required and therefore returns true.

Element Information

XPath	`//RibbonDiffXml/RuleDefinitions/DisplayRules/DisplayRule/ReferencingAttributeRequiredRule \| //RibbonDiffXml/RuleDefinitions/DisplayRules/DisplayRule/OrRule/Or/ReferencingAttributeRequiredRule`
Schema Name	ReferencingAttributeRequiredRuleType
Validation File	RibbonTypes.xsd
Can be Empty	Yes

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