Rule blocked: SEND57 SEND57.1

Rule is: "In some cases, a variable value may comprise multiple individual values. In these cases, each contributing value is a separately collected or analyzed item...In these scenarios, when controlled terminology applies to the corresponding variable, each contributing value must be included as its controlled terminology submission value, and delimited from other terms by a semicolon."

Essentially, it means that when a variable value contains one or more semicolons for a variable that is under controlled terminology, the value must ve split into parts, and for each part, it is checked whether the part is one from the controlled terminology.

I presume we need an "operation" for this ...