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ABAP_ST - Data Nodes in Conditions For addressing data nodes in logical expressions>, a special rule applies. Data nodes as dnode> operands of preconditions>, assertions>, or conditions> can be specified as follows:
If the name node>, specified in accordance with the preceding addressing rules, contains a letter or an underscore in its first place and only letters, digits, hyphens, or underscores in the remaining positions, it can be specified directly.
The special names $ref> and $alias> can also be specified directly.
All other names must be specified in the form ref('node')>. This particularly applies to the specification of a data root using .root >.