Use field from file header record in detail records

Hi,
I receive a file with different records type (transmission header, file header, detail records, file footer). The fields in each record type are different. The transmission header tells me who the sender of the file is. I need this information, because I am merging data of various senders into one table.
When processing the files, I need to split each file according to recordtype. (I can not use the same logic for each recordtype). How can I populate an extra column in the detail files with the value from the header record?
What I tried so far is the following:
- Populate a global variable using a script: This does not seem to work in the context of dataflows.
- Create a 'join' between header record and detail record. However there are no fields I can join, so Data Services is not happy with that.
- Store the field value from the header record in a DS (I chose a cache datastore, memory datastore did not work in batch scenario. I feel I can get this to work, but it seems quite an elaborate and expensive solution: First Filter the header record from the file, write the required field to the cache datastore, then read the same file but now filter the detail records, and join this with the datastore.
Is there a better way to do this? I was hoping I could just use a script and read the first line of my file and move the value to a global variable....
It would be great if someone could give me some tips...
Many thanks,
Jan.

Hi Werner,
I am not sure if I understand you correctly.
I have declared $State as a global variable, not as a parameter.
When I check my custom function I do get a warning that a variable is called which is not declared.
I thought I did not have to worry about this as the variable does exist within the job where the function is called.
It looks like I can not set a value to a global variable in a custom function.
Is that correct, or is there something wrong with my syntax?
Really the only reason I call a custom function is to set the global variable, so I could even make my function as simple as this:
$State = 'NSW';
Return 0;
It still doesn't work...
Any idea why?
Thanks,
Jan.

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Use field from file header record in detail records

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