Issue with Text Field Expression

[francois.barrier]

Hello,

I got an issue with an expression that we have written and with my colleague we don't issue where is the problem : 

Here the expression :

($F{RECEIVEDDT}==null ? "N/A" :
(LTRIM($F{SAMPLETYPEID}))=="Master Seed" ?
(WORKDAY($F{RECEIVEDDT},2)) :
(LTRIM($F{SAMPLETYPEID}))=="WS" ?
(WORKDAY($F{RECEIVEDDT},4)) :
"ERROR"
)

The Goal is to calculate an expiry date, if Sample Type = MS, then Exp. Date = received date + 2 working days

If Sample Type = WS, then Exp. Date = received date + 4 working days.

In our case, the value for the test is Sample Type = WS, but the result of the expresion is always ERROR...

Do you have any Idea ?