On calculation of the (cracked) deformation over time, following message appears:

*Combinations in time are missing*

[NL]: Combinaties in de tijd ontbreken

[FR]: Des combinaisons dans le temps manquent

[ES]: Faltan combinaciones en el tiempo

## Solution

In order to calculate the deformation over time, Diamonds needs at least to be present:

- t
_{0} - Combination for cracking
- 1 combination in time

Without these, the deformation over time will not run. Here’s how to define the above parameters:

- Go back the
**Loads**window - Click on
**Define load groups** - Fill out the 2 columns
**t**and_{0 }**Combination for cracking****t**: time at which the load applies to structure [days]_{0}*.*Example: 28 days is a typical value for the selfweight.

**Combination for cracking**: reference combination for the cracking in time evaluation. Recommended is to take ULS RC 1 (NL: BGT ZC 1, FR: ELS CR 1), as all other evaluation of cracking in Diamonds is based on ULS RC.

- Click on ‘Define combinations for deformation over time’
**Generate all combinations automatically**(easiest) or Create a combination of your own- Click
**Ok** - Recalculate the model
- Run the reinforcement calculation
- Run the deformation over time