Parent ID Concept

[SushmitaSinha]

Hi Everyone,
I am relatively new to OCPP. While I was going through it to implement Parent ID feature, I went through the 1.5 document which said " Central system has the ability to group id-tags, thus allowing one id-tag in a group to start a transaction and another id-tag in the same group to stop the transaction. IdTags are grouped by appointing one idTag in the group to be the parent. The value of Parent idTag of every idTag (including the parent) in the group is set to the value of this parent idTag/ Two idTags are considered to be in the same group when their parent idTags matches” whereas in OCPP 1.6 document it says “Even though the Praent ID has the same nominal datatype (idToken) as an idTag the value of this element may not be in the common format of idTokens and/or may not represent an actual valid idToken (EX: It may be a common shared account number), therefore the parent ID value should not be used for comparison against a presented token value (unless it also occurs as an idTag values).”

From this what I understood is Parent ID can be either any character but upto max length 20 or can be idToken as well. If Parent ID is a token, the token which is set as Parent ID will also come under the same Parent ID group.
We can start, stop and reserve the transaction from any token which falls under that Parent ID

Please help.
TIA

@goekay : Any input would be of great help.