Final version:
Actions for Button Freigabe PA beantragen

=> Same for all the checks
Cleint side click
-> No check
-> Show a pop up similar to PA bearbeiten (loading panel) with generic text "Freigabe wird vorbereitet. Dieser Prozess kann bis zu einer Minute dauern. Bitte warten Sie..."

Backend Click
-> Do PFK check (Remove IsPfkChecked)
--->Do PFK
-> Rebind data
-> Do PA Actual check (IsPaActual)
---> Do PA
-> Do PA check (CheckProjektauftrag)
-> Show approvals dialog

We need two parts: - Server side
Part 2 is called when the condition is not met and also when the check passes
Part 1: PFK check
=>Hide the loading panel
=> Check condition (!this.IsLocked)
Initialise the dialog and from the current server side code (cBtnApprovalPFK_Click)
1. Tools.RegisterClientScriptBlock (PFK dialog)
2. Do the server side initialisation (cBtnApprovalPFK_Click)
=>When condition is not met, call part 2 ( All other checks)

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PFK dialog
User clicks on the Weiter button
->The actual PFK check is done (cBtnPKFCheckStart_Click)
--> When the check passes, hide the PFK dialog and then continue Part 2
--> When the check fails, the process stops

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Part 2: All other checks
2.0. Rebind data
2.1. IsPaActual
-> Check the condition (this.WebpartDisplayMode == DisplayMode.BusinessCase && !this.IsLocked)
---> If true, check IsPaActual
-------> If true, then go to 2.2
-------> If false, then show Dialog, disable button
---> If false, then go to 2.2

2.2 CheckProjektauftrag
-> Check the condition (this.WebpartDisplayMode == DisplayMode.BusinessCase && !this.IsLocked && !this.ProjectInfo.IsAuftragstopf)
---> If true, check CheckProjektauftrag
-------> If true, 
-------> If false, then show PA check Dialog
---> If false, then go to 2.3

2.3 Approval Dialog (BindApprovals)
-> Show approval dialog
-> BindApprovals


Testing: 
1. Check current checks
2. webpart for PA, CR,AB 
3. the whole approval workflow process (creating, updating, cancelling)



Generic Process for any checks - Backend
-> Check conditions if the check is necessary (If the conditions fail then next step)
--->Initialise the data necessary for the check(do the check, Eg. PFK -> show the dialog and checks happen later)
--->Hide the current loading panel
---> Show the necessary dialog (Tools.RegisterClientScriptBlock)
==> If the check passes, then next step, if the check fails then the process cancels/ stops